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List of marine aquarium plant species

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Summary

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A [[seagrass]] aquarium housing several [[seagrass meadow]] inhabitants

Aquatic plants are used to give the aquarium a natural appearance, oxygenate the water, and provide habitat for fish, especially fry (babies) and for invertebrates. Some aquarium fish and invertebrates also eat live plants. Hobby aquarists use aquatic plants for aquascaping.

Marine algae are also included in this list for convenience, despite the fact that many species are technically classified as protists, not plants.

Brown macroalgae

Brown macroalgae are sometimes seasonally available in the aquarium trade and under suitable conditions, will grow quite prolifically. They possess the pigment Fucoxanthin which gives them their coloration ranging from yellow to dark brown. A few are desirable yet many are pests with some species being rather difficult to remove, often making their way into aquariums on live rock.

Common name	Image	Taxonomy	Care Level	Growth rate	Nutrient uptake	Lighting	Waterflow	Palatable	Description	Max size
Brazilian brown alga		Canistrocarpus cervicornis	Easy	Moderate	Good	Moderate-High	Moderate-High	Somewhat	This very hardy algae thrives in shallower waters. It features flat, spiraling blades which may or may not feature iridescence and vary from olive brown to gold in coloration. Though it does not grow very quickly, pruning is necessary to maintain an individual. Once known as Dictyota cervicornis.	10 in
False sargasso	[[File:Cystoseira 0001.JPG	120px	center]][[File:Chainbladder kelp (Cystoseira osmundacea).jpg	120px	center]]	Cystoseira sp.	Moderate	Slow	Fair	Moderate-High	Moderate-High	No	A rare algae in the aquarium trade, commonly confused with Sargassum which has flat blades while False Sargasso has tight toothlike appendages. It also has lower nutrient requirements due to its smaller size. Characterized by its stiff stipes, the outermost of which support pneumatocysts, and its light brown coloration.	18 in
Iridescent algae	[[File:Algas (Dictyota dichotoma), isla de Mouro, Santander, España, 2019-08-14, DD 26.jpg	120px	center]]	Dictyota sp.	Moderate	Moderate	Good	Moderate-High	Moderate-High	Somewhat	The appearance of species within this genus varies greatly. Some display blue iridescence while others are a dull olive color. Larger bladed species are desirable as smaller ones can become invasive. However, all grow in clumps (on hard surfaces or as epiphytes) and are quite delicate, being known to clog pumps and filters. In the wild, the algae is abundant in the intertidal zone and shallow reef flats. Manual removal and clean up crew, like Longnose decorator crabs, can be used to combat this algae	12 in
Encrusting fan-leaf algae	[[File:Lobophora_sp._from_Vietnam.jpg	120px	center]]	Lobophora sp.	Moderate	Moderate	Good	Low-Moderate	Low-Moderate	Somewhat	This algae is very similar to Scroll algae although it is not calcified, being rubbery to the touch. It comes in various shades of brown and green and because it comes from deep waters, it requires little lighting. Rarely does it enter aquariums, which usually occurs when it hitchhikes on live rock. Surprisingly, the algae has a rhizoidal holdfast despite seeming to primarily encrust.	10 in
Scroll algae	[[File:Padina sp.jpg	120px	center]][[File:Sea weed narikel zinzira 1.jpg	120px	center]]	Padina sp.	Expert	Slow	Fair	Moderate-High	Moderate-High	No	Also known as Potato algae, it is quite desirable given its beauty, which may be enhanced if Coralline algae is allowed to encrust its surface. The algae itself features green to brown coloration and grows in the shape of a rounded or split, irregular cup with concentric rings. Its single holdfast should be affixed to a hard bottom and calcium supplementation is required for growth as it is calcified.	6 in
White scroll algae	[[File:Padina sanctae-crucis.jpg	120px	center]]	Padina sanctae-crucis	Expert	Slow	Fair	Moderate-High	Moderate-High	No	This species of algae, also known as Peacock algae, is the most common of the Padina genus in the aquarium trade. It often enters aquariums on live rock.	~6 in
Brown algae		Polycladia myrica	Moderate	Slow	Fair	Moderate-High	Moderate-High	No	This algae makes seasonal appearances in the aquarium trade and originates from The Bahamas and Florida. Once known as Cystoseira myrica.
Gulfweed	[[File:FMIB 38393 Sargassum filipendula.jpeg	120px	center]]	Sargassum filipendula	Expert						This algae is naturally found on both sides of the Atlantic Ocean, and serves as habitat for a variety of marine animals. Because it features pneumatocysts, individual specimens will float without a holdfast. Additionally, it should only be attempted by advanced aquarists. Also known as Sargassum weed.	79 in
White-vein sargasso	[[File:Sargassum hystrix (White-vein Sargassum Algae).jpg	120px	center]]	Sargassum hystrix	Expert	Slow	Fair	High	Moderate-High	Not really	This species is tolerable of cooler temperatures than most other macroalgae. It attaches itself to hard surfaces, using a holdfast, in shallow, turbulent environments and keeps itself upright with a sturdy stipe. The algae grows large, brown blades and a variety known as Sargassum hystrix buxifolium exists, lacking a white-colored mid rib.	24 in
Deep-toothed gulfweed	[[File:Svenska vetenskapsakademien handlingar (1888) (14592833079).jpg	120px	center]]	Sargassum platycarpum	Expert	Slow	Fair	High	Moderate-High	Not really	This species extends serrated, golden blades from its thick stipes along with pneumatocysts to hold it upright. Individuals may also grow a holdfast and the ones that do are most suitable for aquariums as they are capable of anchoring themselves. It is often found on live rock and should frequently be pruned.	30 in
Leafy flat-blade algae		Stypopodium zonale	Moderate			Moderate			This species of algae produces highly toxic extracts that are harmless toward smaller grazers including amphipods and polychaetes yet are capable of killing herbivorous reef fish. Death occurs within 10 hours of the algae's introduction to a well-aerated aquarium during which the fish will attempt to jump out.	8 in
Pyramid seaweed	[[File:Turbinaria ornata Réunion 2.jpg	120px	center]][[File:Turbinaria turbinata (blistered saucer leaf algae) (San Salvador Island, Bahamas) 2 (15860786168).jpg	120px	center]]	Turbinaria sp.	Expert	Slow	Fair	High	Moderate-High	To some fish	This tough macroalgae is rubbery to the touch, features toothed, triangular blades, and anchors itself to substrate using a holdfast. It is quite variable, with some individuals growing in short, tight clusters while others feature a tall stipe. It prefers to be placed near the top of an aquarium, becoming quite hardy in the presence of strong flow and lighting.	2 in

Green macroalgae

Green macroalgae are extremely diverse and abundant, coming in a wide variety of shapes. They possess the pigment Chlorophyll which gives them their coloration ranging from bright green to yellow or dark jade. Reproduction via fragmentation or the releasing of spores are utilized by this macroalgae group. The second option, which is used by the genus, Caulerpa, can be quite problematic in an aquarium. Some species of green macroalgae have greater ease surviving in high nutrient environments or inadequate water parameters than other kinds of macroalgae and are generally the most suitable for nutrient removal due to their rapid growth rates.

Common name	Image	Taxonomy	Care Level	Growth rate	Nutrient uptake	Lighting	Waterflow	Palatable	Description	Max size
Mermaid's wine glass	[[File:Unbekannte Alge.jpg	120px	center]]	Acetabularia sp.	Moderate	Slow	Poor	High	Low	Yes	A beautiful and interesting genus of algae which, unfortunately, tends to be short-lived in aquariums. It grows a disc-like appendage which is more pronounced in certain species, is easily broken when removed from water, and may be removed to start a new colony. A hard surface to attach to as well as calcium supplementation are required to grow the calcified algae.	4 in
Basket weave	[[File:Anadyomene wrightii.JPG	120px	center]]	Anadyomene sp.	Moderate	Slow	Poor	Moderate	Moderate	To some fish	Most specimens make their way into aquariums through live rock and amongst calcareous algae from the wild, staying small in captivity. It possesses rigid, variable, irregularly shaped blades which are characterized by their patterned veins. Anadyomene saldanhae and Anadyomene stellata are the most popular species of this genus.	10 in
Fan weed	[[File:Avrainvillea cf. amadelpha.jpg	120px	center]]	Avrainvillea sp.							This species of algae grows a central stalk supporting a single, fan-shaped blade.
Green sea sausage seaweed	[[File:Album général des Cryptogames, Pl. 92.jpg	120px	center]]	Bornetella nitida	Moderate			Moderate	Low	Not really	In the wild, this algae grows in shallow water environments such as tide pools and on tumbling beach rocks. It features firm, yet elastic fronds which grow vertically and take on a reddish coloration during their growth stage. Provided with an environment suitable for soft corals, the algae will grow in its most desirable shape.	2 in
Spherical turtle shell	[[File:Bornetella sphaerica.jpg	120px	center]]	Bornetella sphaerica	Moderate			Moderate	Low	Not really	In the wild, this algae grows in shallow water environments such as tide pools and on tumbling beach rocks. It features firm, yet elastic fronds which take on a reddish coloration during their growth stage. Provided with an environment suitable for soft corals, the algae will grow in its most desirable shape.	2 in
Bryopsis	[[File:Phycologia britannica, or, A History of British sea-weeds, containing coloured figures, generic and specific characters, synonymes, and descriptions of all the species of algae inhabiting the shores (14595646840).jpg	120px	center]]	Bryopsis sp.	Easy	Fast				Somewhat	This algae is usually seen as a nuisance though it may be desirable in Macroalgae tanks. Though it is rarely sold on its own, it often enters aquariums through live rock and is hard to eradicate due to its firm grip on rockwork. Its coarse composition aids in accumulating detritus from which it can derive nutrients. Eradication can be achieved through the use of grazers (including several crabs, mollusks, and sea urchins), manual removal, light starvation, and nutrient reduction. Elevated magnesium may hinder the growth of the algae but can be dangerous to invertebrates.
Sea fern	[[File:Bryopsis cf. pennata Réunion.jpg	120px	center]]	Bryopsis pennata	Easy	Fast				Somewhat	One of the most difficult species of algae to eradicate in the hobby. This algae is characterized by its pronounced midrib and mat-like rhizoids. Compared to Bryopsis plumosa, Bryopsis pennata features more irregular and sparsely branching fronds.	4 in
Hen pen	[[File:Bryopsis plumosa 53552509.jpg	120px	center]]	Bryopsis plumosa	Easy	Fast				Somewhat	One of the most difficult species of algae to eradicate in the hobby. This algae is characterized by its pronounced midrib and mat-like rhizoids. Compared to Bryopsis pennata, Bryopsis plumosa features more symmetrical and densely branching fronds.	4 in
Giant feather algae		Caulerpa asmeadii	Easy	Moderate	Good	Moderate	Low-Moderate	Somewhat	This is a large species of Caulerpa although unlike its relatives, it won't outgrow its environment as it is slow-growing. It features a thick rhizome which should be pinched when pruned to reduce the amount of pollutants released. Younger individuals may be confused with Caulerpa sertularioides, which inhabits shallower habitats and both may be sold as Feather algae.	14 in
Sea mustard	[[File:Mini caulerpa (Caulerpa brachypus).jpg	120px	center]][[File:Mini caulerpa (Caulerpa brachypus) 2.jpg	120px	center]]	Caulerpa brachypus	Easy	Fast	Good	Moderate-High	Moderate	Somewhat	Also known as Mini caulerpa. Though this uncommon species of Caulerpa is more palatable than Caulerpa prolifera, herbivorous fish tend not to consume it. It will attach itself to both rocks and sand substrates with rhizoids, is a good refugium addition for nutrient export and housing microinvertebrates, and requires regular pruning.	1 in
Umbrella algae	[[File:Caulerpa cf peltata.jpg	120px	center]]	Caulerpa chemnitzia	Easy	Fast	Excellent	Moderate	Moderate-High	Not really	Rarely seen in the hobby and can be found in dim habitats in the wild. The algae is excellent at stripping a tank of nutrients so it must be carefully monitored. Two varieties exist, one with smooth, round blades and the other with concave blades. Was known as Caulerpa peltata and also may be called Saucer algae and Mushroom algae.	6 in
Zipper algae	[[File:Caulerpa cupressoides (Vahl) C.Agardh (AM AK338885).jpg	120px	center]]	Caulerpa cupressoides	Easy	Slow	Fair	Moderate-High	Moderate	No	This interesting and undemanding species of Caulerpa prefers to grow on sand, however it can grow off of harder surfaces. The algae features long, stiff stipes bordered by notched blades and is naturally found growing in shallow-water seagrass meadows. Seahorses will readily use its stipes as hitching posts. Also known as Cactus caulerpa.	8 in
Banana algae	[[File:Caulerpa cylindracea (10.3897-BDJ.9.e64535) Figure 6.jpg	120px	center]]	Caulerpa cylindracea	Easy	Fast	Excellent	Moderate-High	Moderate-High	No	This tall algae features cylindrical blades, making it resemble a cluster of bananas, as well as a dark green coloration. It is excellent at stripping a tank of nutrients so its size must be limited. Though it is mostly inedible, some fish may nip at its holdfast.	6 in
Razor algae		Caulerpa floridana	Easy			Moderate			This algae, also known as Florida caulerpa, originates from shallow environments such as lagoons and bays and enters aquariums through Caribbean and Floridian live rock. It is not very popular in the hobby.
Small sea grapes	[[File:LATO SEAWEEDS.jpg	120px	center]]	Caulerpa lentillifera	Moderate	Fast		High	Moderate	Yes	This species of Caulerpa prefers to grow on rockwork though it may venture out onto the substrate. Under strong lighting, it will grow dense blades, resembling clusters of grapes. Additionally, it is known to be edible to humans and is also called Green caviar, Latok, and Umibudo.	6 in
Fern algae	[[File:Alger, Caulerpa crassifolia, Nordisk familjebok.png	120px	center]]	Caulerpa mexicana	Easy	Moderate	Good	Moderate	Low-Moderate	Somewhat to fish	This species of tight-bladed Caulerpa can grow on hard surfaces as well as sandy and muddy substrates. In turbulent surroundings, it grows somewhat compact and in calmer surroundings, it grows taller. Its adaptability to lighting requirements allows it to grow in environments without direct lighting amongst other algae (such as under ledges).	8 in
Coin Caulerpa		Caulerpa nummularia							This algae can be maintained in a refugium with constant exposure to light and regular pruning every few weeks. It uses a rhizome to anchor to rocks and substrate and can be very difficult to remove once established.	≤1 cm
Palm tree algae	[[File:Green Algae Down Below.jpg	120px	center]][[File:Palm tree algae (Caulerpa paspaloides) Shoots.jpg	120px	center]]	Caulerpa paspaloides	Easy	Moderate	Excellent	Moderate	Low-Moderate	Somewhat	This species of Caulerpa is a good nutrient export choice as it pollutes aquariums less often than its relatives and is fast growing. It should be pruned regularly as its fine structure captures undesirable substances. Under more intense lighting, the algae's palm-shaped blades will grow more compact and triangular in addition to taking on a darker shade of green.	12 in
Bladed sand moss	[[File:Caulerpa prolifera kz01.jpg	120px	center]]	Caulerpa prolifera	Easy	Fast	Excellent	Moderate	Low-Moderate	Somewhat	Bladed sand moss is well-suited for aquariums as it grows slower than other members of its genus and is easily pruned. It desires sandy substrates, inhabiting seagrass meadows in the wild, and will grow wider blades in turbulent water and taller, thinner blades in calmer environments. Out of all the Caulerpa species that are commercially available, this one is the most popular and widespread, commonly used to cover sand beds in marine planted aquariums.	6 in
Coarse sea grapes	[[File:Caulerpa racemosa algae.jpg	120px	center]][[File:Caulerpa racemosa Sea grapes.jpg	120px	center]]	Caulerpa racemosa	Easy	Fast	Excellent	Moderate-High	Moderate-High	Somewhat	Unlike other species of Caulerpa, this one grows round, clustered blades. It is notorious for releasing spores and stripping tanks of available nutrients as well as its invasively rapid growth (having given the entire Caulerpa genus a bad rap). As such, it must be carefully monitored and pruned. Many varieties of this algae exist worldwide which are highly varied and inhabit shallow-water environments.	8 in
Sawtooth algae	[[File:Caulerpa serrulata Réunion.jpg	120px	center]]	Caulerpa serrulata	Easy	Moderate	Good	Moderate	Low-Moderate	Somewhat	This smaller sized, hardy species of algae is often available and put in refugiums for nutrient export or used to create thick bushes in the foreground of an aquarium. It originates from shallow habitats where it prefers to grow on small rocky objects and its stiff nature makes it unappetizing to most organisms. Weaker lighting will lessen the jaggedness of its twisted blades.	5 in
Green feather algae	[[File:Caulerpa sertularioides.jpg	120px	center]]	Caulerpa sertularioides	Easy	Fast	Excellent	Moderate	Low-Moderate	Yes	This shallow-water Caulerpa species features fronds with rounded tips. It is very popular among hobbyists although it grows quickly, easily taking over aquariums. However, it is a great choice for refugiums considering how many fish and invertebrates enjoy eating it. The algae prefers to grow on hard surfaces, yet its adaptability allows it to also grow on the sand bed and climb aquarium walls.	8 in
Killer algae	[[File:Caulerpa taxifolia Feather algae.jpg	120px	center]]	Caulerpa taxifolia	Easy	Fast	Excellent	Moderate	Low-Moderate	No	Also known as Fern algae and Feather plant, this algae can become quite invasive in the wild as it is able to survive in a wide range of temperatures and grows rapidly. For this reason, it is rare within the United States. It appears similar to Caulerpa mexicana although its dark-green fronds are more uniform and spaced further apart. The algae will spread on both rocks and sand.	10 in
Fluffy green seaweed	[[File:Caulerpa verticillata.jpg	120px	center]]	Caulerpa verticillata	Easy	Fast		Low-High			Though this is a rather short species of the Caulerpa genus, Fluffy green seaweed or Fuzzy caulerpa can grow extremely quickly, even on walls. As such, it is only suitable for marine planted aquariums. Regular pruning should be performed by twirling the algae's blades around one's fingers, separating it's holdfast from hard surfaces. Amphipods and copepods enjoy living within the algae.	5.9 in
Spaghetti algae	[[File:More Green Spaghetti!.jpg	120px	center]][[File:Chaeto 2.JPG	120px	center]][[File:FilamentousChlorophyceae SaintJosephReunion.jpg	120px	center]]	Chaetomorpha sp.	Easy	Fast	Excellent	Low-High	Moderate	Not really	Also called Chaeto, this algae grows as a tangled mass of green filaments and originates from shallow, nutrient rich environments. It is incredibly popular with aquarists since it serves as habitat for microinvertebrates (such as amphipods and copepods) and rapidly consumes excess nutrients (though care must be taken to replenish these nutrients such as iron, nitrates, and phosphates). For this reason, it is often kept in a refugium where it can either be tumbled or left to float. Despite being hardy and easy to grow, care must be taken to meet the different environmental requirements of the different species of Spaghetti algae.	24 in mound
Tall hair alga	[[File:Chaetomorpha crassa - National Museum of Nature and Science, Tokyo - DSC07623.JPG	120px	center]][[File:Chaetomorpha aerea (Dillwyn) Kuetz. (AM AK354586).jpg	120px	center]]	Chaetomorpha aerea	Easy	Fast	Excellent	Moderate	Moderate	Yes	Once known as Chaetomorpha crassa. It is rare example of a hair algae species suitable for marine aquariums, being an excellent refugium addition. In captivity, the stiff, filamentous algae serves as habitat for microinvertebrates, provides nutrient export, and can be fed to herbivores, though it should ideally be tumbled. Naturally, this algae is found in the intertidal zone.	6 in mound
Floating chaeto	[[File:Chaetomorpha linum-salt marsh algae.jpg	120px	center]][[File:Chaetomorpha linum Crouan.jpg	120px	center]]	Chaetomorpha linum	Easy	Fast	Excellent	Moderate-High	Moderate	No	How To Grow Chaetomorpha in a Sump Refugium https://www.youtube.com/watch?v=BBio2DA28m8. In: YouTube https://www.youtube.com/	16 in
Curly Chaeto	[[File:Icones of Japanese algae (Pl. XCV) (6049927195).jpg	120px	center]]	Chaetomorpha spiralis	Moderate	Fast	Excellent	High	Moderate		Also known as Spaghetti algae and Green hair algae (not Derbesia). This hardy algae is composed of clumped, long filaments, thicker and more brittle than those of Chaetomorpha linum. It is an excellent addition for refugiums, serving as habitat for microinvertebrates and providing nutrient export.	20 in
Green tide alga	[[File:Cladophora coelothrix Crouan.jpg	120px	center]]	Cladophora coelothrix				High			This algae is composed of compacted filaments, forming a sphere. It does best in cooler water.	20 in
Toadstool algae	[[File:Naturalis Biodiversity Center - L.4123669 - Cladophora prolifera (Roth) Kütz. - Chlorophyceae - Plant type specimen.jpeg	120px	center]]	Cladophora prolifera	Easy	Slow	Poor	Moderate-High	Low-High	Somewhat	This species of shallow-water algae grows in clumps on rocks and rubble, featuring rigid, finely branched filaments. Many aquarists believe it is a nuisance since it will become hard to remove after establishing itself. However, microinvertebrates enjoy living within the algae, such as starfish. May also be called Green bush, Moss ball, and Sea hair.	20 in
Green wiry algae	[[File:Cladophoropsis sundanensis.jpg	120px	center]][[File:Cladophoropsis sudanensis.jpg	120px	center]]	Cladophoropsis sp.		Slow				Yes	This low-lying algae creeps along rocks and can be difficult to remove. Often, it is found on frags and live rock. It is known to persist in low-nutrient environments. Also known as Bob Ross algae.
Turtleweed	[[File:2018 fiji, 16 april, coral corner, mask cleaning algae (27996622928).jpg	120px	center]][[File:Chlorodesmis fastigiata.jpg	120px	center]]	Chlorodesmis sp.	Expert	Moderate	Good	High	Moderate-High	No	Also known as Maiden's hair plant, this popular, stringy algae is often mistaken for hair algae and enters the aquarium trade on live rock and coral. It is toxic, making it inedible and capable of effecting coral growth, though microinvertebrates enjoy living within the algae such as amphipods and copepods. If the blades of the algae turn white, they should be removed.	8 in
Dead man's fingers	[[File:Codium fragile novae-zelandiae 72423786.jpg	120px	center]][[File:Codium spongiosum Réunion.jpg	120px	center]]	Codium sp.	Easy	Slow	Fair	Moderate-High	High	No	Some forms of this algae feature a single holdfast with multiple irregular branches and others encrust surfaces taking on a blob-like shape. They should be placed on hard surfaces and kept in water temperatures under 80 F. Though the main structure of Dead man's fingers is inedible, some fish may graze on the fuzzy filaments that cover its surface.	12 in
Green fleece	[[File:FMIB 38390 Codium decorticatum.jpeg	120px	center]]	Codium decorticatum	Easy	Slow		High	Low	Not really	This desirable algae features thick, fingerlike protrusions that provide habitat for microcrustaceans and can break apart if disturbed. Though it floats, it can be attached to solid surfaces with superglue. In nature, it is distributed worldwide in shallow waters, though it is rare in the aquarium hobby.	12 in
Tufted joint algae	[[File:Not very green Tufted joint algae (Cymopolia barbata).jpg	120px	center]]	Cymopolia barbata	Moderate	Slow	Fair	High	Moderate-High	Not really	This species of prehistoric-looking algae is rarely available although it may enter aquariums through live rock. It is quite interesting, but requires calcium supplementation as it is calcified. Pieces of the algae may be clipped and fed to Tangs and Rabbitfish. Also known as Palm tree algae.	12 in
Usugasane		Cymopolia vanbosseae	Easy			Moderate	Moderate		In the wild, this algae grows in shallow water environments. It is calcified and its base is white due to the lack of Chlorophyll. In the aquarium, this algae will deteriorate if other algae is allowed to grow on its surface and should be exposed to fluorescent lighting for dense frond growth (though the algae can be grown under LED lighting).	2 in
Green hair algae	[[File:Derbesia sp..jpg	120px	center]][[File:GreenHairAlgae.jpg	120px	center]]	Derbesia sp.		Fast	Excellent		High	Yes	Green hair algae is the desired algae in algae scrubbers for nutrient export and the rearing of microinvertebrates. Outside scrubbers, it is a pest and is distinguished from similar algae by its lack of a root system, delicate nature, and fine texture. Removal is simple as it can be pulled or scrubbed off rockwork and sifted from sand and is highly palatable to a variety of herbivores. Proper water quality and low nutrient levels also discourage the growth of this algae as does lighting that is less red.
Green bubble weed	[[File:Dictyosphaeria cavernosa (green bubble weed) 3 (15992584651).jpg	120px	center]]	Dictyosphaeria cavernosa				Various		Somewhat	In the wild, this green to bluish algae thrives in rocky crevices where detritus can accumulate. It will tolerate a variety of lighting intensities and survive in aquariums with low nutrient levels. The algae is made up of easily-seen, bubble shaped cells which, when ruptured, release new cells that will settle throughout an aquarium system.	5 in
Isosugina	[[File:Halicoryne wrightii Okamura 1908 pl XLIII.jpg	120px	center]]	Halicoryne wrightii				Moderate	Low	Yes	In the wild, this algae grows in shallow water environments such as tide pools and on tumbling beach rocks. The algae's yellow-green coloration is a result of limestone deposits on its fronds which requires specific Carbonate hardness levels to form. This algae will become weakened if other algae is allowed to grow on its surface.	2 in
Large leaf watercress algae	[[File:Watercress algae (Halimeda discoidea).jpg	120px	center]]	Halimeda discoidea	Easy	Moderate	Fair	Moderate-High	Moderate	Somewhat	Out of all the Halimeda species, this one possesses the largest segments and unlike its relatives, only grows on hard surfaces. It requires calcium supplementation as it is calcified, making it a good food for grazers (such as Tangs) as it helps keep their digestive tracts free of blockages. Also known as Money plant and Rosette halimeda.	10 in
Three finger leaf algae	[[File:Halimeda incrassata.jpg	120px	center]][[File:Halimeda incrassata (calcareous green algae) (San Salvador Island, Bahamas) 1 (15867649357).jpg	120px	center]]	Halimeda incrassata	Easy	Moderate	Fair	Moderate-High	Moderate	No	Also known as Money plant, this algae either grows in clumps or forms several branches. It requires calcium supplementation as it is calcified (making it a good food for clearing blockages in the digestive tracts of grazers) and a sand bed at least 4 in deep. While generally small, this algae will rapidly reproduce under favorable conditions, sprouting new individuals near its base.	8 in
Jointed-stalk algae	[[File:Image from page 169 of "Botanisk tidsskrift" (1866).jpg	120px	center]]	Halimeda monile		Slow	Fair	Low-High		No	This algae is ideal for use in aquascaping as it is inedible. Though it can be housed under a wide range of lighting strengths, it grows best under Moderate-High lighting and prefers to grow in finer substrates. It also requires calcium supplementation as it is calcified. Individuals will appear stressed when they attempt to spread, using the majority of their energy to produce new growth.	8 in
Prickly pear	[[File:Watercress algae (Halimeda opuntia).jpg	120px	center]]	Halimeda opuntia	Easy	Moderate	Fair	Moderate-High	Moderate	No	This algae forms large mounds of tight segments and attaches itself to rocks and sand using several holdfasts. It requires calcium supplementation as it is calcified (making it a good food for clearing blockages in the digestive tracts of grazers). However, under the right conditions, it can be used to form a ground cover. Also known as Money plant, Carpeting halimeda, and Watercress alga.	10 in
Money plant	[[File:Image from page 376 of "Contributions from the New York Botanical Garden" (1899-).jpg	120px	center]]	Halimeda scabra				Low-High			This algae is named after its coin-shaped segments. Though it can be housed under a wide range of lighting strengths, it grows best under Moderate-High lighting. It also requires calcium supplementation.	5 in
Cactus algae	[[File:Capo Gallo 021.jpg	120px	center]]	Halimeda tuna				Low-High			Cactus algae is common on reefs and is amongst the most imported species of the Halimeda genus for aquariums. Though this algae can be housed under a wide range of lighting strengths, it grows best under Moderate-High lighting. It requires calcium supplementation as it is calcified, making it a good food for grazers (such as Tangs) as it helps keep their digestive tracts free of blockages. Also known as Money plant.	5 in
Ringed finger seaweed	[[File:Alien fingers (Neomeris annulata).jpg	120px	center]]	Neomeris annulata	Moderate	Slow	Fair	Moderate	Low	Somewhat	This species of spongy, fuzzy algae grows in small clusters or individually and spreads by extending its holdfast on rockwork or Mangrove roots and growing new fronds. It is lightly calcified and should be provided with calcium supplementation. Also known as Finger algae and may become highly invasive.	4 in
Mermaid's shaving brush	[[File:Penicillus capitatus-Rhodos.jpg	120px	center]]	Penicillus capitatus	Easy	Moderate	Fair	Moderate-High	Low-Moderate	No	This species of algae generally grows out of the sand bed on reef flats and seagrass meadows, anchoring itself with rhizoids, although it may grow on rocks. It requires a sand bed at least 4 in deep along with calcium supplementation like many other calcified stem plants. In aquariums, a mature specimen will often die, only to produce new individuals at its base.	8 in
Neptune's shaving brush	[[File:Penicillus dumetosus (shaving brush algae) (San Salvador Island, Bahamas) 3 (15425532054).jpg	120px	center]]	Penicillus dumetosus	Easy	Moderate	Fair	Moderate-High	Low-Moderate	No	This species of Penicillus grows to be larger than others of its own genus and features a more tapered top. In the wild, it grows on reef flats and seagrass meadows, anchoring itself with rhizoids. In the aquarium, it requires a sand bed at least 4 in deep and calcium supplementation. A mature specimen will often die, only to produce new individuals at its base.	8 in
Flat-top bristle brush	[[File:Image from page 432 of "Atoll research bulletin" (1951).jpg	120px	center]]	Penicillus pyriformis	Easy	Moderate	Fair	Moderate-High	Low-Moderate	No	This species of Penicillus grows to be larger than others of its own genus and features a completely flattened top. In the wild, it grows on reef flats and seagrass meadows, anchoring itself with rhizoids. In the aquarium, it requires a sand bed at least 4 in deep and calcium supplementation. A mature specimen will often die, only to produce new individuals at its base.	8 in
Pinecone algae	[[File:Rhipocephalus phoenix (pinecone alga) (San Salvador Island, Bahamas).jpg	120px	center]]	Rhipocephalus phoenix	Easy	Moderate	Fair	Moderate-High	Moderate	No	This pinecone-shaped algae attaches itself to sandy substrate (and occasionally rocks) using a bulb-like structure possessing several rhizoids. It requires a sand bed at least 4 in deep and calcium supplementation. In the wild, it grows on reef flats, seagrass meadows, and Halimeda forests.	6 in
Mermaid's fan	[[File:Udotea flabellum (mermaid's fan alga) Bahamas.jpg	120px	center]]	Udotea flabellum	Easy	Moderate	Fair	Moderate-High	Moderate	No	This species of calcified algae is very popular and requires a sand bed at least 4 in deep along with calcium supplementation. Given that its requirements are met and conditions are favorable, an individual Mermaid's fan will rapidly reproduce, sprouting new individuals from its base. Rhizoids also extend from the base, anchoring the algae.	12 in
Fan algae	[[File:Naturalis Biodiversity Center - L.3998634 - Udotea orientalis A.Gepp and E.Gepp - Algae - Plant type specimen.jpeg	120px	center]]	Udotea orientalis	Easy	Slow		High	Low		This species of algae attaches itself to a sand substrate, preferring the same environment as sand-rooted Halimeda such as Halimeda opuntia. Since it grows slowly, algae can easily grow on this species' surface under poor water quality, weakening it.	2 in
Gutweed	[[File:Gutweed at low tide in Brofjorden 4.jpg	120px	center]][[File:Ecomare - darmwier (darmwier-2120-ogb).jpg	120px	center]]	Ulva sp.	Easy	Fast	Excellent	Moderate-High	Low-Moderate	Yes	Gutweed or Tube algae is common in both tropical and temperate waters. The algae forms tube-like blades secured by a single holdfast to hard surfaces and Mangrove roots. In the aquarium, this algae should be kept in water temperatures under 80 F and may be used to feed herbivorous fish. It was previously classified under the genus Enteromorpha.	10 in
Sea lettuce	[[File:Meerlattich Juist.JPG	120px	center]][[File:Meersalat-Ulva-lactuca.jpg	120px	center]][[File:Ulva "sp.1" (AM AK300767).jpg	120px	center]]	Ulva sp.	Easy	Fast	Excellent	Moderate-High	Moderate	Yes	Sea lettuce is common in both tropical and temperate waters. The algae forms flat sheets which either anchor themselves with holdfasts or float by trapping pearled air bubbles. Its growth rate is comparable to that of Chaetomorpha, is nearly as popular, and is similarly good at absorbing excess nutrients in aquariums, housing microinvertebrates, and requires iron supplementation. It is usually kept in refugiums and since it is relished by many aquarium inhabitants, it can be harvested there and fed to organisms in display tanks. Care must be taken to protect return pumps when using Sea lettuce since the latter can easily clog the former.	8 in mound
Winding nori	[[File:Ulva flexuosa pilifera Wulfen (AM AK345174).jpg	120px	center]]	Ulva flexuosa						Yes	This algae is filamentous in nature and is great for feeding Sea urchins. Once known as Enteromorpha flexuosa.	24 in
Grass lettuce	[[File:Gutweed in Lahälla marina 1.jpg	120px	center]]	Ulva intestinalis	Easy	Fast	Excellent	Moderate-High	Low-Moderate	Yes	Also known as Gutweed and Grass kelp and once known as Enteromorpha intestinalis. This increasingly popular, hardy algae is a good refugium addition and can be fed to fish. Individuals may attach to sand or rocks with a holdfast or be left to float. The algae also serves as habitat for microinvertebrates and seahorses will readily use its filamentous blades as hitching posts.	12 in
Common sea lettuce	[[File:Alge Düne2.jpg	120px	center]]	Ulva lactuca	Easy	Fast	Excellent	Moderate-High	Moderate	Yes	This popular algae grows in ruffled, thin sheets which, in the event it does not feature a holdfast (which it will slowly develop if attached to a rock), will trap pearled air bubbles and cause it to float. Good nutrient uptake, the ability to house microinvertebrates, and palatability by herbivorous fish are characteristic of the algae as well as the necessity for iron supplementation. In low nutrient environments, it may get stressed and become invasive.	24 in
Bubble algae	[[File:Valonia ventricosa.jpg	120px	center]][[File:Valonia fastigiata.jpg	120px	center]]	Valonia sp.	Expert	Moderate	Good	High	Moderate-High	No	Also known as Sailor's eyeballs, this algae is usually viewed as a pest, often entering aquariums on live rock. It has the ability to choke out corals if it grows too large and unfortunately, very few animals consume it (one of which is the Emerald crab (Mithraculus sculptus)). They may be desirable in marine planted aquariums, however. The algae itself is comprised deep green, spore filled spheres.	8 in

Red macroalgae

Red macroalgae are highly sought after in the aquarium trade given their intense coloration and striking appearance. They possess the pigment Phycoerythrin which gives them their vivid coloration ranging from red to orange to blue. For some species, identification is difficult and slight variations due to location and depth may exist.

Common name	Image	Taxonomy	Care Level	Growth rate	Nutrient uptake	Lighting	Waterflow	Palatable	Description	Max size
Spiny algae	[[File:Spiny algae (Acanthophora spicifera).jpg	120px	center]]	Acanthophora spicifera	Easy	Moderate	Good	Moderate-High	Moderate-High	Not really	This variable species comes in shades of red, yellow, purple, and green. Bright lighting brings out paler color while darker color is brought out by bluer lighting. Its structure consists of branches, finer and more compact than those of Laurencia. The fast growing algae must be pruned regularly. Also known as Fire fern.	8 in
Agar	[[File:FMIB 52473 Rhabdonia fenera.jpeg	120px	center]]	Agardhiella sp.				High		Yes	The algae, Agardhiella, has similar requirements to Gracilaria and Ulva and features translucent, gelatinous fronds. In captivity, it can tolerate, but must first be slowly introduced to bright lighting and can be fed to fish. It is also a source of the substance, agar.	12 in
Agardh's red weed	[[File:FMIB 38425 Agardhiella tenera, slender form from coral reef.jpeg	120px	center]][[File:FMIB 38440 Agardhiella tenera, usual form.jpeg	120px	center]]	Agardhiella subulata							This reddish purple, gelatinous algae is characterized by its numerous branchlets. It is edible to humans. Once known as Agardhiella tenera.	12 in
Worm wart weed		Agarophyton vermiculophyllum	Easy	Moderate	Good	Moderate-High	Moderate-High	Somewhat	This is a hardy species suitable for marine aquaria. It develops darker coloration under lower intensity light and is best attached to rockwork with superglue. Once known as Gracilaria vermiculophylla and also commonly called black wart weed.	12 in
Red sea plume	[[File:Asparagopsis taxiformis Réunion 2 cropped.JPG	120px	center]]	Asparagopsis taxiformis	Moderate	Moderate	Good	Moderate-High	Moderate-High	Yes	This algae firmly attaches to hard surfaces using multiple rhizomes as it lives in turbulent environments. It grows reddish, somewhat iridescent filaments that are compacted into clusters of cone shaped branches. It occasionally enters the aquarium trade on Pacific live rock and is also called Limu. Its sporophyte stage may be a type of Cotton candy algae, which is a fast-growing pest.	6 in
Red grape	[[File:Two Macros.jpg	120px	center]][[File:Sea grapes (Botryocladia pseudodichotoma) 2.jpg	120px	center]]	Botryocladia sp.	Easy	Slow	Good	Moderate	Moderate	Yes	This is a beautiful, hardy, highly palatable genus of macroalgae with several species available in the aquarium trade. It bears a resemblance to a cluster of grapes, possessing stiff, lightly calcified branches covered in bright red pneumatocysts. Excessively high light will pale these pneumatocysts. Also known as Red berries as well as Red grape caulerpa despite not belonging in the Caulerpa genus.	18 in
Red grape macroalgae	[[File:FMIB 38433 Chrysymenia uvaria.jpeg	120px	center]]	Botryocladia botryoides	Moderate	Moderate	Moderate	Low-Moderate		Yes	Despite its popularity, this algae is not often seen in the aquarium trade and is seasonally available. However, new individuals are easily produced by fragmenting the stipes of this algae. Additionally, especially when stressed, the algae may lose its pneumatocysts, though these are quickly regrown. In nature, it is found in shaded environments as well as the intertidal zone.	4 in
Indonesian red grape		Botryocladia leptopoda	Easy			Moderate	Moderate		This popular species of algae has been available in the aquarium trade for a long time. It branches upward as it grows and forms dense fronds under high lighting.	6 in
Red grape kelp	[[File:Botryocladia occidentalis.jpg	120px	center]]	Botryocladia occidentalis	Easy	Moderate		Low	Low-Moderate		Grows rather quickly for a species of red macroalgae and may attach both to sand and hard surfaces, though it is unlikely to become invasive. Since it prefers low lighting, it is not ideal for refugiums and is rarely available. It may be sold as Red grape caulerpa despite not belonging in the Caulerpa genus. It also keeps itself upright with pneumatocysts.	5 in
Red Valonia		Botryocladia skottsbergii		Fast		Low		Yes	Unlike desirable species of Botryocladia, undesirable species do not feature calcified branches. The development of spots indicates the algae is ready for sexual reproduction, and it is likely that popping its bladders releases spores. Aggressive manual removal and clean up crew like Mithrax crabs and rabbitfish can be used to combat this algae.	0.5 in
Red bubble algae		Botryocladia pyriformis						Yes	Unlike desirable species of Botryocladia, undesirable species do not feature calcified branches. Aggressive manual removal and clean up crew like Mithrax crabs and rabbitfish can be used to combat this algae.
Flame algae	[[File:Plate 96 (Taylor, 1945).jpg	120px	center]]	Bryothamnion sp.		Moderate	Good	Low-High			Characterized by a striking red coloration which darkens under higher lighting. The algae features spiky, calcified branches, which extend in all directions and can easily be trimmed to create new individuals. It is best suited for display aquariums and must be attached to hard surfaces using glue or rubber bands as it cannot do so on its own.	12 in
Red razor	[[File:Red razor (Bryothamnion triquetrum).jpg	120px	center]]	Bryothamnion triquetrum	Easy	Moderate	Poor	Moderate	Moderate-High	No	Depending on lighting, Red razor may sport either a bright or deep red coloration. In the wild, the stiff, serrated algae grows in shaded environments with strong current. It is a great addition to a Seahorse tank as its stipes may serve as hitching posts. However, it must be attached to hard surfaces using glue or rubber bands as it cannot do so on its own.	8 in
Cotton candy algae	[[File:FMIB 53617 Rhodophycees ou Floridees (Algues rouges) Ceramiees, Callithamnion corymbosum (Sm) Lyngb.jpeg	120px	center]][[File:Callithamnion granulatum 19880601a.jpg	120px	center]]	Callithamnion sp.		Fast				Yes	Also known as red turf alga. Cotton candy algae ranges in shape from irregular tufts to branches and ranges in coloration from pink to red. Stiffer filaments develop under stronger current. If left unchecked, this algae can smother rockwork, equipment, and corals, and is difficult to eradicate. Manual removal, water quality improvement, and removal of detritus can be used to combat this algae. Herbivores, like rabbitfish and Mexican turbo snails and competition from other algae can also be employed against cotton candy algae.	4 in
Red Chaeto	[[File:Caulacanthus-ustulatus-19880601a.jpg	120px	center]][[File:Caulacanthus ustulatus Jymm 01.jpg	120px	center]]	Caulacanthus ustulatus							Unfortunately, this is an invasive species in the home aquarium and is unsuitable for reef systems and refugiums. Its prickly thallus is fragile and easily breaks up into fragments that can develop into new individuals once they settle.	1 in
Bird-Nest	[[File:Chondria-capillaris-19980602b.jpg	120px	center]]	Chondria sp.	Easy	Moderate	Good	Moderate-High	Moderate-High	Not really	Is a genus of highly variable (depending on the species), shallow-water turf algae that often enters aquariums on live rock and coral frags. Though it is attractive and typically remains small, it can quickly overgrow a system's rockwork. The algae features fine, compact fronds which are somewhat iridescent and translucent. Manual removal is fairly easy.	12 in
Iridescent Cartilage Weed	[[File:Chondria coerulescens Crouan.jpg	120px	center]]	Chondria coerulescens					Moderate-High		This algae inhabits very shallow water in areas sheltered from waves. It is rare in the aquarium trade and displays blue coloration under high lighting. Otherwise, it will appear reddish to purplish.
Coralline algae	[[File:Coralline algae encrusted live rock.jpg	120px	center]] [[File:Crustose coralline algae, South East Bay, Three Kings Islands PA121443.JPG	120px	center]] [[File:Calliarthron sp.jpg	120px	center]]	Corallinales sp.	Moderate	Slow	None	Moderate-High	Moderate-High	No	This order of red, calcified macroalgae is highly variable, taking on both geniculate (branching) and nongeniculate (encrusting and plating) forms as well as a variety of colors, generally ranging from purple to pink. It often makes its way into aquariums through the introduction of live rock or wild caught snails and hermit crabs where they are highly desirable as a result of their attractive appearance and ability to outcompete nuisance algae for space. However, since Coralline algae readily attaches itself to hard surfaces, it can become problematic when it grows on glass and aquarium equipment as it is hard to remove due to its carbonate skeleton.	10 in
Red ribbon	[[File:FMIB 38453 Cryptonemia crenulata.jpeg	120px	center]]	Cryptonemia crenulata	Easy	Slow	Poor	Low-Moderate	Moderate	No	This large, hardy macroalgae is incredibly rare in the aquarium hobby, though it is highly sought after. It features long, stiff, deep red blades from which new individuals and leaflets are budded. In the wild, it often attaches its holdfast to the bases of sessile invertebrates, such as gorgonians, sponges, and tunicates.	24 in
Chenille algae	[[File:Dasya hutchinsiae Crouan.jpg	120px	center]]	Dasya sp.	Expert	Slow	Fair	Moderate-High	Moderate-High	Not really	This algae is found in both tropical and temperate waters worldwide though is most often collected from Florida and the Gulf of Mexico. It features limp, fleshy branches coated in filaments and attaches itself to hard surfaces with a single holdfast. Due it its preference for lower water temperatures, it may not be suitable for most marine planted aquariums.	10 in
Red seabroom	[[File:Hydrophytologiae Regni Neapolitani icones (14207079246).jpg	120px	center]]	Digenea simplex							This red, mat-like algae serves as habitat for a great diversity of microinvertebrates and is coated in fuzzy filaments.	4 in
Red star burst macroalgae	[[File:Eucheuma denticulatum in an off-bottom cultivation, Bweleo, Zanzibar.JPG	120px	center]]	Eucheuma denticulatum	Expert	Slow		Moderate-High	Moderate		An incredibly difficult species of macroalgae to care for as it demands very stable, lower temperature environments and struggles to survive in small aquarium systems. It has a rubbery composition; comes in yellow, orange, and red colorations; and is made up of spiny branches and branchlets. Once known as Eucheuma spinosum.	12 in
Tubular thicket	[[File:Plate 19 (Dawson, 1953).jpg	120px	center]]	Galaxaura sp.	Expert	Slow	Fair	High	Moderate-High	No	This algae is heavily calcified and attaches itself to hard surfaces. It grows branches with flattened ends and is reddish to purplish in coloration depending on the species. Most enter aquariums on live rock and require calcium supplementation in addition to intense lighting as they originate from shallow water. Also known as Pom pom algae.	8 in
Pink galaxy	[[File:Red seaweed, Galaxaura rugosa, Daedalus Reef, Red Sea, Egypt.jpeg	120px	center]][[File:Galaxaura rugosa.jpg	120px	center]]	Galaxaura rugosa	Easy	Moderate		Low-High	Low-High	Yes	Under low light or shade, this algae will appear pinkish. Brighter lighting will make it take on a reddish coloration. The algae has no waterflow preferences and grows in the shape of a dome (breaking its branches will distort the dome shape it grows into).	Over 4 in
Indonesian red feather		Gelidiaceae sp.	Easy	Slow		Moderate	Moderate	Somewhat	This algae, also known as Red grass plant, has been available in the aquarium trade for a long time. Since it originates from deep water, it remains easy to care for, even without strong lighting. The algae radiates outward as it grows and will form dense fronds under good water quality and moderate lighting.	5 in
Red wiry turf algae	[[File:Gelidium latifolium.jpg	120px	center]][[File:Gelidium sp.jpg	120px	center]]	Gelidium sp.	Easy	Slow	Good	Moderate-High	Moderate-High	Not really	This fan-shaped algae ranges from yellow to red in coloration. It attaches itself to hard surfaces with a single holdfast or may drift, tangled with other species. The algae is rarely available, often being sold as Gracilaria and is difficult to remove from rockwork. Also known as Red turf algae, Red wiry algae, Fern algae, and Brush algae.	10 in
Purple Fauchea	[[File:Fauchea laciniata.jpg	120px	center]]	Gloiocladia sp.	Easy	Slow	Poor	Moderate-High	Moderate-High	Somewhat	A rare algae that occurs naturally as solitary individuals in depths upwards of 20 ft. It features serrated or rounded fronds with a metallic iridescence on its dorsal side and a reddish coloration on its ventral side; higher intensity lighting will make the algae more violet. It is best attached to rockwork with superglue. Smaller herbivores have difficulty consuming its thick thallus.	4 in
Arcuate ogo		Gracilaria arcuata	Easy	Slow		Moderate	Moderate	Somewhat to some fish	This algae grows on shallow reefs and, depending on the environment, displays different colors (blackish with strong lighting, bright red with soft lighting). Due to its durability and slow growth rate, it is suitable for many different varieties of marine aquariums.	4 in
Red ogo		Gracilaria cervicornis						Yes	This species of red macroalgae can be found in a wide array of different colors and is a preferred food of tangs and angelfish.
Red bush ogo	[[File:Broad classification of algae.png	120px	center]]	Gracilaria curtissiae	Easy	Slow	Fair	Moderate-High	Moderate-High	Yes	Being a slow grower, Red bush ogo may take several weeks to develop a holdfast and is best attached to rockwork with superglue or by tucking it into a crevice. Individuals grow to form symmetrical bushes and develop darker coloration under lower intensity light. The algae is naturally found the intertidal zone. Also known as Red macroalgae and Ruby red algae.	18 in
Pom pom	[[File:Pom pom ogo (Gracilaria hayi).jpg	120px	center]]	Gracilaria hayi	Easy	Slow	Fair	Moderate	Moderate-High	Not really	This flame-like algae grows in the shape of a symmetrical, dense bush and may either attach to rocks with a holdfast or float freely. It is quite undemanding, tolerating a variety of conditions, though it is slightly calcified and may require calcium supplementation. Lower light levels will bring out the algae's most desirable, deep crimson red coloration (more light will result in duller coloration).	24 in
Red mat algae		Gracilaria mammillaris	Easy	Moderate	Fair	Moderate	Moderate-High	Somewhat	This hardy algae grows reasonable quickly, rapidly attaching itself to substrate and other algae with its tendrils, and thus requires pruning. Individuals grow to form sheet-like plates that provide cover for copepods and rotifers and develop darker coloration under lower intensity light. It is also very rare in the marine aquarium trade.	6 in{{Cite journal	last1=Schneider
Long ogo	[[File:Long ogo (Gracilaria parvispora).jpg	120px	center]][[File:Gracilaria parvispora refugium.jpg	120px	center]]	Gracilaria parvispora	Easy	Moderate	Good	Moderate-High	Moderate-High	Not really	This algae is characterized by long, cylindrical fronds and a single holdfast. The coloration of an individual depends on the depth it was collected from (ranging from bright red to yellow or green). It is the most popular and one of the fastest growing of the red Gracilaria species in the aquarium trade and is hardy under a variety of conditions. It is also widely used in refugiums and can be harvested as an excellent food source for a variety of herbivorous organisms. Seahorses will readily use its thallus as a hitching post. Also known as Birds nest and Red ogo.	10 in
Graceful redweed	[[File:Gracilaria tikvahiae (graceful redweed) (Cayo Costa Island, Florida, USA) 3 (24022495910).jpg	120px	center]]	Gracilaria tikvahiae	Easy	Moderate	Good	Moderate-High	Moderate	Yes	This algae is highly variable depending on the environment. Under higher waterflow, it grows compact flattened blades as opposed to long cylindrical blades and may also take on red, brown, and green colorations. Individual Graceful redweed can be found attached to hard surfaces or free floating and may be tumbled in refugiums. It is also an excellent food source for many herbivores.	16 in
Dragon's tongue	[[File:Icones of Japanese algae (9935825876).jpg	120px	center]]	Halymenia dilatata	Easy	Slow-Fast	Good	Low-Moderate	Moderate-High	Yes	A stunning, easily recognizable species, characterized by fiery, serrated fronds. Depending on its environment, it will either grow in a compact form or extend and become flowy in nature. In the wild, it is found in subtidal, reef-associated regions of the Western Atlantic Ocean. It is also relished by large herbivores and can be kept in a refugium.	Over 18 in
Dragons breath	[[File:FMIB 38419 Meristotheca duchassaingii; a cystocarpic; b, tetrasporic, bearing Streblonema invisibile.jpeg	120px	center]]	Halymenia duchassaingii	Expert						Shares its common name with Halymenia durvillei. It is an attractive algae species, naturally found in reef-associated areas on hard surfaces. In the captivity, its delicate nature makes it difficult to care for, and it is rarely seen in the aquarium trade.	3 in
Dragon's breath	[[File:Dragon’s breath (Halymenia durvillei).jpg	120px	center]]	Halymenia durvillei	Easy	Moderate	Good	Moderate-High	Moderate-High	Yes	This reddish algae has a soft composition (though more rigid and thicker than those of other members of its genus) with tips that will fluoresce a vibrant orange to yellow under moderately strong actinic lighting. It is highly popular, though it is often confused with other species, such as Halymenia dilatata and Gracilaria hayi. The algae grows in cycles and must be regularly split to be preserved.	14 in
Red finger	[[File:Halymenia elongata.jpg	120px	center]]	Halymenia elongata	Moderate	Moderate	Good	Moderate-High	Moderate-High	Yes	This algae possesses a gelatinous composition and a yellow to pink coloration. It forms tube-like blades anchored by a single holdfast. Though it is rarely sold in the hobby, it often enters aquariums on live rock from the Gulf of Mexico and through spores.	12 in
Flagweed	[[File:Halymenia floresia (Clemente) C.Agardh (AM AK339854).jpg	120px	center]]	Halymenia floresii	Moderate	Slow	Good	Low-Moderate	Moderate-High	Yes	This sktriking, popular, highly palatable, and easily obtained species of Halymenia, like others belonging in its genus, is very delicate and possesses a smooth, gelatinous texture. It should be manually anchored or allowed to float freely as it rarely forms a holdfast. Other names for this algae include Red sea lettuce and Dragon's tongue.	20 in
Red sea lettuce	[[File:FMIB 38454 Halymenia gelinaria.jpeg	120px	center]]	Halymenia floridana	Easy	Moderate	Good	Low-Moderate	Moderate-High	Yes	Depending on depth, this algae may take on a red to yellow coloration. Like others of its genus, it is very delicate and possesses a smooth, gelatinous texture. It is also compact and features rounded and irregular blades like Sea lettuce. It should be manually anchored or allowed to float freely as it rarely forms a holdfast.	18 in
Leafy sphere ogo		Halymenia maculata	Easy	Slow	Fair	Moderate-High	Moderate-High	Yes	This popular and vibrant species features stiff, blotchy purplish-light red to deep red blades, based on lighting conditions (however, it will turn grey under excessively high intensity light). Additionally, it is highly palatable to larger herbivorous fish and makes for a good refugium addition. In the wild, it is found in subtidal, reef-associated regions of the Indian and Western Pacific Oceans. Also known as Leafy ogo.	7 in
Flamingo feather algae		Heterosiphonia gibbesii	Difficult		Fair	High	High	Yes	As this algae is difficult to keep alive, it should only be attempted by experienced aquarists. It possesses a delicate complex of branches which may feature red, pink, brown, or yellow coloration. It also prefers cooler water temperatures, between 72 °F and 78 °F. Since it is palatable, it should be kept away from most herbivores.	8 in
Rusty rock	[[File:Hildenbrandia rubra Crouan.jpg	120px	center]]	Hildenbrandia rubra	Easy			Low			It is a pinkish, calcareous algae that encrusts solid surfaces and has minimal requirements. Once known as Hildenbrandia prototypus.	8 in
Encrusting red algae	[[File:Hydrolithon sp. à confirmer.jpg	120px	center]][[File:Hydrolithon craspedium in Fiji (7341796178).jpg	120px	center]]	Hydrolithon sp.	Moderate	Slow	None	Moderate-High	Moderate-High	No	This calcified genus of Coralline algae encrusts shallow-water rocks, helping to build reefs by cementing dead coral together. It is pink-purplish in coloration and features irregular knobs. Fragments of the algae may be placed in aquariums to kickstart the growth of Coralline algae.	10 in
Tattered sea moss	[[File:Hypnea cf. pannosa.jpg	120px	center]]	Hypnea pannosa	Moderate	Moderate		Moderate-High	Moderate		Also known as Blue hypnea, this algae takes on red, green, and purple colorations, though blue individuals are the most highly sought after. It grows in bushy clusters, much like Ochtodes which it is sometimes confused with. Despite not being ideal for nutrient export in aquaria, it remains popular for its coloration and iridescence (which may be enhanced under blue lighting).	8 in
Pink segmented algae	[[File:FMIB 53615 Rhodophycees ou Floridees (Algues rouges) Corallinees, Corallina rubens Ell.jpeg	120px	center]]	Jania sp.	Easy			Moderate	Moderate		This is a Coralline algae, composed of calcified, red to pink branches with white joints. It is naturally found in shady, sheltered areas.	6 in mound
Red fern	[[File:FMIB 38457 Corallina cubensis.jpeg	120px	center]][[File:Jania rosea (Lam.) Decne. (AM AK221610-2).jpg	120px	center]]	Jania sp.	Easy	Moderate	Fair	Moderate-High	Moderate	Somewhat	This popular genus of macroalgae grows calcified branches with fern shaped blades and has a red or pink coloration. It can be found growing on live rock and some species are epiphytic and grow on other algae. Most species in this genus are temperate water species yet they can tolerate warmer temperatures. Also known as Smooth kelp and was once known as Haliptilon.	8 in
Slender-beaded coral weed	[[File:Jania rubens.jpg	120px	center]]	Jania rubens	Easy			High		Not really	In nature, this hardy species is found in shallow water, often as an epiphyte on other algae. It features lightly calcified, maroon branches which require adequate flow to be maintained.	6 in
Filamentous red alga		Kapraunia schneideri							This is a seasonal species and is naturally found attached to hard surfaces in winter.
Purple bush algae	[[File:Laurencia.jpg	120px	center]][[File:Laurencia obtusa found in Wimereux.jpg	120px	center]]	Laurencia sp.	Easy	Moderate	Good	Moderate	Moderate	Yes	This genus of undemanding algae is highly variable and it may be difficult to differentiate between its species. Typically, they are bright red (lower light will bring out a deeper red) with short, stiff, cylindrical branches. It is found on hard bottoms of shallow-water environments, such as reef flats and seagrass meadows, often as an epiphyte. It is also highly palatable.	8 in
Spaghetti weed	[[File:Liagora sp..jpg	120px	center]][[File:Liagora sp.jpg	120px	center]]	Liagora sp.	Expert	Slow	Fair	Moderate-High	Moderate-High	Not really	This compact algae has a gelatinous composition and is moderately calcified. It is rare in the hobby due to its delicate nature and little is known about its care, though spores of the algae often enter aquariums through Pacific and Indonesian live rock. The algae features a pale pink to deep purple coloration.	10 in
Plate coral weed	[[File:Lithophyllum orbiculatum 037.jpg	120px	center]][[File:Lithophyllum carpophylli (Heydr.) Heydr. (AM AK348710-3).jpg	120px	center]]	Lithophyllum sp.	Moderate	Slow	None	Moderate-High	Moderate-High	No	This calcified genus of Coralline algae encrusts hard surfaces, helping to build reefs by cementing dead coral together. It is pink in coloration and grows plate-like projections, often with white edges. If it has not already been introduced on live rock, fragments of the algae may be placed in an aquarium. The algae also requires calcium supplementation.	8 in
Red air dancer	[[File:Flickr - BioDivLibrary - n212 w1150 (2).jpg	120px	center]]	Nemastoma sp.	Moderate	Moderate	Good	Moderate-High	Moderate-High	Yes	Very similar to Halymenia elongata and may also be called Red finger, though this rare algae is more compact. Its gelatinous branches are filled with fluid, helping to orient the algae upright. Often, the tips of these branches are colored orange or white. The algae most often enters aquariums on live rock and can be grown under lower light levels.	6 in
Blue ball	[[File:Flickr - BioDivLibrary - n246 w1150.jpg	120px	center]]	Ochtodes sp.	Moderate	Moderate	Good	Moderate-High	Moderate	Somewhat	Marine Macroalgae Lagoon Planted Reef 3 Year Update https://www.youtube.com/watch?v=3i4UaAOCP-k. In: YouTube https://www.youtube.com/	6 in
Burgundy crust algae	[[File:Live Rock All About Fish 4.jpg	120px	center]][[File:Peyssonnelia squamaria.jpg	120px	center]]	Peyssonnelia sp.				Low	Moderate		This algae resembles Coralline algae, with edges that resemble peeling paint. It grows by encrusting.
Laver	[[File:Porphyra (haploide y diploide).jpg	120px	center]][[File:Porphyra umbilicalis.jpg	120px	center]]	Porphyra sp.							In the wild, this translucent, purplish algae can be found floating freely or attached to solid surfaces with a small, yet incredibly strong holdfast. As it resides in the intertidal zone, it is well adapted to becoming dehydrated as the tide recedes. Also known as Nori, Red nori, and Purple laver and is edible to humans.	12 in
Red feather	[[File:Portieria hornemannii.jpg	120px	center]]	Portieria sp.			Good		Moderate		This lesser-known algae is quite attractive, growing flat branches covered in segmented branchlets. Depending on its environment, the algae will take on a yellow, orange, or red coloration (deep red under aquarium lighting). It is also highly variable in terms of its size and composition.	8 in
Silk skin		Pugetia japonica				Moderate	Low-Moderate	Yes	Silk skin grows in deeper regions of the intertidal zone and is best viewed under lighting with red and blue wavelength lamps. The algae grows as a single cloth-like frond which does not branch finely and should be handled with care due to its delicate nature. Once known as Callophyllis okamurae.	12 in
Red bone grass	[[File:Phycologia australica; or, A history of Australian sea weeds and a synopsis of all known Australian Algae (1859) (14592752388).jpg	120px	center]]	Rhodopeltis sp.	EasyRhodopeltis sp.
Red finger algae		Scinaia complanata	Moderate-ExpertScinaia Macro Algae
Moniliform sea moss		Scinaia hormoides						Yes	This species grows in clumps and is favored by tangs.	3 in
Red bamboo algae	[[File:Solieria chordalis Crouan.jpg	120px	center]]	Solieria sp.	Easy	Moderate	Fair	Moderate-High	Moderate	Somewhat	This is a unique, uncommon algae with fleshy, cane-like fronds that split into new fronds at their ends. It is difficult for small herbivorous fish to consume, though it may be fall prey to tangs. While it can secure itself to rocks and coarse substrates with its holdfasts, it is ideally attached to rockwork with superglue.	12 in
Ribbon algae		Tricholgloea sp.	Expert	Slow	Fair	Moderate-High	Moderate	No	This algae possesses a gelatinous composition and flat branches with white ribs. Some species are mildly calcified and they range from red to purple in coloration. It is naturally solitary, being found on hard bottoms in pristine environments. It is also incredibly rare in the aquarium hobby and is difficult to care for.	10 in

Mangroves

Most mangroves that end up in the aquarium trade are either collected as seeds or grown on land. Their leaves should be exposed to the air, well beyond the surface of the water, and be sprayed with freshwater regularly to prevent salt buildup. They also require intense lighting and a layer of substrate, not too shallow as to let the tree topple over and not too fine which would make parts of the sandbed to go anaerobic.: How to properly care for mangrove trees in ‘aquaria’ https://reefbuilders.com/2015/10/06/properly-care-mangrove-trees-aquaria/#. In: Reef Builders | The Reef and Marine Aquarium Blog https://reefbuilders.com

Common name	Image	Taxonomy	Care Level	Growth rate	Description	Max size
Black mangrove	[[File:Avicennia germinans-flowers.jpg	Cayos Mangrove02	120px	center]]	Avicennia germinans	Moderate	Slow		70'
Red mangrove	[[File:Rhizophora mangle BotGardBln1105RootsLeaves.JPG	120px	center]]	Rhizophora mangle	Easy	Slow		80'
White mangrove	[[File:Laguncularia racemosa.jpg	120px]]	Laguncularia racemosa	Expert	Slow		60'

Seagrass

Turtle grass, Thalassia hemprichii and Thalassia testudinum
Manatee grass, Syringodium filiforme

Nuisance algae

While algaculture is more popular in marine aquaria than in a freshwater setting, there are several species of algae that are unwanted or problematic. These species can be very difficult to remove once established. They are disseminated in the aquarium trade through improperly collected or processed material, such as live rock.

Hair algae

While there many species that may be referred to as "hair algae", species in the genera Bryopsis and Derbesia are among the most common. Bryopsis plumosa is especially troublesome. Boodlea species are occasional in marine aquaria, and may be called "crunchy hair grass". Red hair algae (Polysiphonia) may also be a nuisance.

Turf algae

"Turf algae" is a broad classifications of algae, and refers to their branched leafy or lawn-like growth habit. Green turf algae include the genera Cladophora (and potentially Cladophoropsis) and Ulva, as well as the species Chlorodesmis fastigiata.

Brown turf algae often arrive on contaminated live rock and include the genus Dictyota as well as the species Lobophora variegata and Padina australis.

Common genera of red turf algae include Galaxaura, Gelidium, and the more common species include Nitophyllum punctatum, Wrangelia argus, and Centroceras clavulatum. Although sometimes desirable, Hypnea musciformis may be considered a pest.

Bubble algae

Bubble algae can grow large and spread rapidly. The red bubble algae Botryocladia skottsbergii is especially problematic and difficult to control. Green bubble algae of the genera Valonia, Ventricaria and the species Dictyosphaeria cavernosa may become nuisances.

Microalgae

The green microalgae Ostreobium is parasitic in stony coral skeletons and compromises the structure of the animal. Brown diatom algae and dinoflagellates are also ubiquitous in marine aquaria. Blue-green algae (cyanobacteria) may also be present, with Phormidium corallyticum causing black band disease in coral.

References

: BROWN MACROALGAE (PHAEOPHYTA) ''[https://www.marineplantbook.com/marineplantbookbrownalgae.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
Dictoya cervicornis ''[https://www.live-plants.com/dictoya.htm]''. In: Gulf Coast Ecosystems [https://www.live-plants.com/index.htm]
This very hardy algae thrives in shallower waters. It features flat, spiraling [[Lamina (algae)
CYSTOSEIRA SP. ''[https://www.marineplantbook.com/marinebookcystoseira.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
DICTOYA SP. ''[https://www.marineplantbook.com/marinebookdictoya.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
LOBOPHORA SP. ''[https://www.marineplantbook.com/marinebooklobophora.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
This algae is very similar to ''[[Padina (alga). Scroll algae]]'' although it is not calcified, being rubbery to the touch. It comes in various shades of brown and green and because it comes from deep waters, it requires little lighting. Rarely does it enter aquariums, which usually occurs when it hitchhikes on [[live rock]]. Surprisingly, the algae has a [[rhizoid]]al [[Holdfast (biology)
PADINA SP. ''[https://www.marineplantbook.com/marinebookpadina.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
This [[species]] of algae, also known as ''Peacock algae'', is the most common of the ''[[Padina (alga)
|| align="center" | Slow || align="center" | Fair || align="center" | Moderate-High || align="center" | Moderate-High || align="center" | No || This algae makes seasonal appearances in the aquarium trade and originates from [[The Bahamas]] and [[Florida]]. Once known as ''Cystoseira myrica''.Polycladia myrica (S.G.Gmelin) Draima, Ballesteros, F.Rousseau & T.Thibaut, 2010 ''[http://www.marinespecies.org/aphia.php?p=taxdetails&id=624315]''. In: World Register of Marine Species: WoRMS [http://www.marinespecies.org/index.php]
Sargassum filipendula Sargassum weed ''[https://www.reeflex.net/tiere/990_Sargassum_filipendula.htm]''. In: Reeflex [https://www.reeflex.net/]
Marine Algae ''[https://gulfspecimen.org/specimen/marine-plants/marine-algae/]''. In: Gulf Specimen Marine Lab: Home [https://gulfspecimen.org/]
Sargassum filipendula C.Agardh, 1824 ''[https://www.marinespecies.org/aphia.php?p=taxdetails&id=494800]''. In: World Register of Marine Species: WoRMS [http://www.marinespecies.org/index.php]
SARGASSUM HYSTRIX VAR. BUXIFOLIUM ''[https://www.marineplantbook.com/marinebooksargassumhystrix.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
SARGASSUM PLATYCARPUM ''[https://www.marineplantbook.com/marinebooksargassumplatycarpum.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
Stypopodium zonale on Scleractinia Kelp ''[https://www.qualitymarine.com/Products/Invertebrates/Wild/Marine-Algae/Stypopodium-zonale-on-Scleractinia/Kelp]''. In: Quality Marine [https://www.qualitymarine.com/]
Lüning, Klaus. (1990). "Seaweeds: Their Environment, Biogeography, and Ecophysiology". Wiley-Interscience.
Stypopodium zonale (J.V.Lamouroux) Papenfuss, 1940 ''[https://www.marinespecies.org/aphia.php?p=taxdetails&id=145392]''. In: World Register of Marine Species: WoRMS [http://www.marinespecies.org/index.php]
TURBINARIA SP. ''[https://www.marineplantbook.com/marinebookturbinaria.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
: GREEN MACROALGAE (CHLOROPHYTA) ''[https://www.marineplantbook.com/marineplantbookgreenalgae.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
: MACRO ALGAE – EVER WANTED A PLANTED SALTWATER AQUARIUM ? ''[http://www.reefaquarium.com/2012/ever-wanted-a-planted-saltwater-aquarium/]''. In: Reef Aquarium [http://www.reefaquarium.com/]
ACETABULARIA SP. ''[https://www.marineplantbook.com/marinebookwineglass.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
ANADYOMENE SP. ''[https://www.marineplantbook.com/marinebookanadyomene.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
Alderton, David. (2008). "Encyclopedia of Aquarium and Pond Fish". DK.
(Saltwater fish) Seaweed Nagamizutama (1) Hokkaido / Kyushu / Okinawa Airmail Insulation required ''[https://item.rakuten.co.jp/chanet/525254/]''. In: Rakuten Ichiba [https://www.rakuten.co.jp/?l2-id=shop_header_logo]
(Saltwater fish) Seaweed Mizutama (1) Hokkaido / Kyushu / Okinawa Airmail Insulation required ''[https://item.rakuten.co.jp/chanet/521395/]''. In: Rakuten Ichiba [https://www.rakuten.co.jp/?l2-id=shop_header_logo]
Live Frag Bryopsis Marine Macro Algae Plant Refugium Saltwater ''[https://www.ebay.com/itm/Live-Frag-Bryopsis-Marine-Macro-Algae-Plant-Refugium-Saltwater-/303331050667]''. In: eBay [https://www.ebay.com/]
Bryopsis ''[https://www.livealgae.co.uk/identification-of-nuisance-micro-algae-in-the-marine-aquarium/bryopsis-nuisance-algae]''. In: Livealgae UK [https://www.livealgae.co.uk/]
Bryopsis ''[https://www.melevsreef.com/critter/bryopsis]''. In: Melev's Reef [https://www.melevsreef.com]
CAULERPA ASHMEADII ''[https://www.marineplantbook.com/marinebookashmeadii.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
Caulerpa Brachypus ''[https://www.livealgae.co.uk/green-macroalgae-species/marine-macroalgae-caulerpa-brachypus]''. In: Livealgae UK [https://www.livealgae.co.uk/]
Also known as ''Mini caulerpa''. Though this uncommon [[species]] of ''[[Caulerpa]]'' is more palatable than ''[[Caulerpa prolifera]]'', [[herbivorous]] [[fish]] tend not to consume it. It will attach itself to both rocks and sand substrates with [[rhizoids]], is a good [[Refugium (fishkeeping)
Caulerpa brachypus Harvey, 1860 ''[http://www.marinespecies.org/aphia.php?p=taxdetails&id=211498#attributes]''. In: World Register of Marine Species: WoRMS [https://www.marinespecies.org/]
CAULERPA RACEMOSA VAR. PELTATA ''[https://www.marineplantbook.com/marinebookpeltata.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
Rarely seen in the hobby and can be found in dim habitats in the wild. The algae is excellent at stripping a tank of nutrients so it must be carefully monitored. Two varieties exist, one with smooth, round [[Lamina (algae). blades]] and the other with concave [[Lamina (algae)
CAULERPA CUPRESSOIDES ''[https://www.marineplantbook.com/marinebookcupress.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
This interesting and undemanding species of ''[[Caulerpa]]'' prefers to grow on sand, however it can grow off of harder surfaces. The algae features long, stiff [[Stipe (botany). stipes]] bordered by notched [[Lamina (algae). blades]] and is naturally found growing in shallow-water [[seagrass meadows]]. [[Seahorses]] will readily use its [[Stipe (botany)
Cactus Caulerpa ''[https://www.reefcleaners.org/aquarium-store/plants-macroalgae/cactus-caulerpa-detail]''. In: Reef Cleaners [https://www.reefcleaners.org/]
CAULERPA RACEMOSA VAR. CYLINDRACEA ''[https://www.marineplantbook.com/marinebookbanana.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
Caulerpa floridana ''[http://www.saltcorner.com/AquariumLibrary/browsespecies.php?CritterID=1982]''. In: Saltcorner [http://www.saltcorner.com/AquariumLibrary/browsesection.php]
Growing Caulerpa Macro Algae in Marine Aquariums & Refugiums ''[https://www.youtube.com/watch?v=utsiGoYkIwg]''. In: YouTube [https://www.youtube.com/]
|| align="center" | || align="center" | High(Saltwater fish) Seaweed Live food Umi-budo mix Gram sale 50g Hokkaido / Kyushu / Okinawa Airmail Insulation required ''[https://item.rakuten.co.jp/chanet/504409/]''. In: Rakuten Ichiba [https://www.rakuten.co.jp/?l2-id=shop_header_logo]
This [[species]] of ''[[Caulerpa]]'' prefers to grow on rockwork though it may venture out onto the substrate. Under strong lighting, it will grow dense [[Lamina (algae). {{convert. 6. in. cm. 1
CAULERPA MEXICANA ''[https://www.marineplantbook.com/marinebookmexicana.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
Caulerpa nummularia ''[https://melevsreef.com/creature/algae-and-plants/caulerpa-nummularia]''. In: Melev's Reef [https://melevsreef.com/]
Caulerpa nummularia ''[http://www.imb.dvo.ru/misc/algae/index.php/en/component/mtree/en2/chlorophyta/order-bryopsidales/family-caulerpaceae/genus-caulerpa/264-caulerpa-nummularia-harvey-ex-j-agardh]''. In: USEFUL MARINE PLANTS OF THE ASIA-PACIFIC REGION COUNTRIES [http://www.imb.dvo.ru/misc/algae/index.php/en/intro2]
CAULERPA PASPALOIDES ''[https://www.marineplantbook.com/marinebookpaspaloides.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
CAULERPA PROLIFERA ''[https://www.marineplantbook.com/marinebookprolifera.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
''Bladed sand moss'' is well-suited for aquariums as it grows slower than other members of its [[genus]] and is easily [[pruned]]. It desires sandy substrates, inhabiting [[seagrass meadows]] in the wild, and will grow wider [[Lamina (algae). blades]] in turbulent water and taller, thinner [[Lamina (algae)
CAULERPA RACEMOSA ''[https://www.marineplantbook.com/marinebookracemosa.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
Unlike other [[species]] of ''[[Caulerpa]]'', this one grows round, clustered [[Lamina (algae). blades]]. It is notorious for releasing [[spores]] and stripping tanks of available nutrients as well as its invasively rapid growth (having given the entire ''[[Caulerpa]]'' genus a bad rap). As such, it must be carefully monitored and [[pruned]]. Many [[Variety (botany)
CAULERPA SERRULATA ''[https://www.marineplantbook.com/marinebookserrulata.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
This smaller sized, hardy [[species]] of algae is often available and put in [[Refugium (fishkeeping). refugiums]] for nutrient export or used to create thick bushes in the foreground of an aquarium. It originates from shallow habitats where it prefers to grow on small rocky objects and its stiff nature makes it unappetizing to most organisms. Weaker lighting will lessen the jaggedness of its twisted [[Lamina (algae)
CAULERPA SERTULARIODES ''[https://www.marineplantbook.com/marinebookfeather.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
CAULERPA TAXIFOLIA ''[https://www.marineplantbook.com/marinebooktaxifolia.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
|| align="center" | Excellent || align="center" | Moderate || align="center" | Low-Moderate || align="center" | No || Also known as ''Fern algae'' and ''Feather plant'', this algae can become quite invasive in the wild as it is able to survive in a wide range of temperatures and grows rapidly. For this reason, it is rare within the [[United States]]. It appears similar to ''[[Caulerpa mexicana]]'' although its dark-green fronds are more uniform and spaced further apart. The algae will spread on both rocks and sand.(Saltwater fish) Seaweed Okinawan Ichiizuta (1 bunch) Hokkaido Air Mail Insulation required ''[https://item.rakuten.co.jp/chanet/520459/]''. In: Rakuten Ichiba [https://www.rakuten.co.jp/?l2-id=shop_header_logo]
Caulerpa verticillata Algae ''[https://www.reeflex.net/tiere/1153_Caulerpa_verticillata.htm]''. In: Reeflex [https://www.reeflex.net/]
Fuzzy Caulerpa ''[https://www.reefcleaners.org/store/fuzzy-caulerpa-detail]''. In: Reef Cleaners [https://www.reefcleaners.org/]
Though this is a rather short [[species]] of the ''[[Caulerpa]]'' [[genus]], ''Fluffy green seaweed'' or ''Fuzzy caulerpa'' can grow extremely quickly, even on walls. As such, it is only suitable for marine planted aquariums. Regular pruning should be performed by twirling the algae's [[Lamina (algae). blades]] around one's fingers, separating it's [[Holdfast (biology). holdfast]] from hard surfaces. [[Amphipoda
CHAETOMORPHA SP. ''[https://www.marineplantbook.com/marinebookchaeto.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
Also called ''Chaeto'', this algae grows as a tangled mass of green filaments and originates from shallow, nutrient rich environments. It is incredibly popular with aquarists since it serves as habitat for microinvertebrates (such as [[Amphipoda. amphipods]] and [[copepods]]) and rapidly consumes excess nutrients (though care must be taken to replenish these nutrients such as [[iron]], [[nitrates]], and [[phosphates]]). For this reason, it is often kept in a [[Refugium (fishkeeping)
Chaetomorpha Strains are Much More Different Than We Ever Knew ''[https://reefbuilders.com/2021/03/23/chaetomorpha-strains-are-much-more-different-than-we-thought/]''. In: Reef Builders. The Reef and Saltwater Aquarium Blog [https://reefbuilders.com/]
Chaetomorpha aerea ''[http://www.saltcorner.com/AquariumLibrary/browsespecies.php?CritterID=1999&filter=0]''. In: Saltcorner [http://www.saltcorner.com/AquariumLibrary/browsesection.php]
Aquacultured Chaetomorpha Crassa – Green ''[https://gulfstreamtropicalaquarium.com/product/aquacultured-chaetomorpha-crassa-green/]''. In: Gulfstream Tropical Aquarium [https://gulfstreamtropicalaquarium.com/]
Chaetomorpha Chaeto Linum Thick ''[https://www.livealgae.co.uk/green-macroalgae-species/chaetomorpha-chaeto-linum-thick]''. In: Livealgae UK [https://www.livealgae.co.uk/]
|| align="center" | Excellent || align="center" | Moderate-High || align="center" | Moderate || align="center" | No || Also known as ''Spaghetti algae''. This stable, greenish algae is composed of unbranched, tangled filaments, finer and more flexible than those of ''[[Chaetomorpha spiralis]]''. It is excellent at nutrient export, but care must be taken to replenish said nutrients in a system containing ''[[Chaetomorpha linum]]'', such as [[nitrate]], [[phosphate]], [[Magnesium]], [[Iodine]], and [[Iron]]. Additionally, [[herbivorous]] [[fish]] cannot digest this algae, though they might attempt to eat it.3 Reasons your CHAETO is DYING | How To Grow Chaetomorpha in a Sump Refugium ''[https://www.youtube.com/watch?v=BBio2DA28m8]''. In: YouTube [https://www.youtube.com/]
Chaetomorpha spiralis (Curly Chaeto) ''[https://www.aquacultureaquariums.com/product/chaeto/]''. In: Aquaculture Aquariums [https://www.aquacultureaquariums.com/]
|| align="center" | ExcellentGreen Saltwater Macro Algae Plant Chaetomorpha aka Chaeto (Chaetomorpha spiralis) - MEDIUM - Excellent for Nutrient Control in an Aquarium ''[https://aquariumdepot.com/green-saltwater-macro-algae-plant-chaetomorpha-aka-chaeto-chaetomorpha-spiralis-medium-excellent-for-nutrient-control-in-an-aquarium/]''. In: AquariumDepot [https://aquariumdepot.com/]
{{convert. 20. in. cm. 1
Cladophora Prolifera ''[https://www.livealgae.co.uk/green-macroalgae-species/marine-macroalgae-cladophora-prolifera-green-bush]''. In: Livealgae UK [https://www.livealgae.co.uk/]
|| align="center" | Low-High || align="center" | Somewhat || This species of shallow-water algae grows in clumps on rocks and rubble, featuring rigid, finely branched filaments. Many aquarists believe it is a nuisance since it will become hard to remove after establishing itself. However, microinvertebrates enjoy living within the algae, such as [[starfish]]. May also be called ''Green bush'', ''Moss ball'', and ''Sea hair''.Cladophora prolifera ''[https://www.live-plants.com/cladophora.htm]''. In: Gulf Coast Ecosystems [https://www.live-plants.com/index.htm]
Cladophora prolifera (Roth) Kützing, 1843 ''[https://www.marinespecies.org/aphia.php?p=taxdetails&id=145060]''. In: World Register of Marine Species: WoRMS [http://www.marinespecies.org/index.php]
|| align="center" | || align="center" | || align="center" | || align="center" | Yes || This low-lying algae creeps along rocks and can be difficult to remove. Often, it is found on frags and [[live rock]]. It is known to persist in low-nutrient environments. Also known as ''[[Bob Ross]] algae''.Yoshii's 10 gallon gorgonian and macro algae biotope ''[https://www.nano-reef.com/featured/2015/yoshii-r100/]''. In: Nano-Reef Community [https://www.nano-reef.com/]
CHLORODESMIS SP. ''[https://www.marineplantbook.com/marinebookturtleweed.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
Also known as ''Maiden's hair plant'', this popular, stringy algae is often mistaken for [[Derbesia. hair algae]] and enters the aquarium trade on live rock and coral. It is toxic, making it inedible and capable of effecting coral growth, though microinvertebrates enjoy living within the algae such as [[Amphipoda. amphipods]] and [[copepods]]. If the [[Lamina (algae). Aquarium Fish, Corals, & More [https://www.liveaquaria.com/]
CODIUM SP. ''[https://www.marineplantbook.com/marinebookcodium.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
Some forms of this algae feature a single holdfast with multiple irregular branches and others encrust surfaces taking on a blob-like shape. They should be placed on hard surfaces and kept in water temperatures under {{convert. 80. F. C. 1
Codium ''[https://www.livealgae.co.uk/green-macroalgae-species/marine-macroalgae-codium]''. In: Livealgae UK [https://www.livealgae.co.uk/]
Deadmans Fingers Plant, Codium decorticatum ''[https://www.aquariumcreationsonline.net/DeadMansFingersPlant.html]''. In: Aquarium Creations Online [https://www.aquariumcreationsonline.net/]
CYMOPOLIA BARBATA ''[https://www.marineplantbook.com/marinebookbarbata.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
This species of prehistoric-looking algae is rarely available although it may enter aquariums through live rock. It is quite interesting, but requires [[calcium]] supplementation as it is calcified. Pieces of the algae may be clipped and fed to [[Acanthuridae. Aquarium Fish, Corals, & More [https://www.liveaquaria.com/]
(Saltwater fish) Seaweed Usugasane with stone (1) Hokkaido / Kyushu / Okinawa Airmail Insulation required ''[https://item.rakuten.co.jp/chanet/525244/]''. In: Rakuten Ichiba [https://www.rakuten.co.jp/?l2-id=shop_header_logo]
Dictyosphaeria cavernosa ''[http://www.saltcorner.com/AquariumLibrary/browsespecies.php?CritterID=2009]''. In: Saltcorner [http://www.saltcorner.com/]
In the wild, this green to bluish algae thrives in rocky crevices where [[detritus]] can accumulate. It will tolerate a variety of lighting intensities and survive in aquariums with low nutrient levels. The algae is made up of easily-seen, bubble shaped [[Cell (biology). cells]] which, when ruptured, release new [[Cell (biology)
(Saltwater fish) Seaweed Isosugina with stone (1) Hokkaido / Kyushu / Okinawa Airmail Insulation required ''[https://item.rakuten.co.jp/chanet/525244/]''. In: Rakuten Ichiba [https://www.rakuten.co.jp/?l2-id=shop_header_logo]
HALIMEDA DISCOIDEA ''[https://www.marineplantbook.com/marinebookdiscoidea.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
Out of all the ''[[Halimeda]]'' species, this one possesses the largest segments and unlike its relatives, only grows on hard surfaces. It requires [[calcium]] supplementation as it is calcified, making it a good food for grazers (such as [[Acanthuridae
Halimeda discoidea ''[https://www.marinelifephotography.com/marine/seaweeds/halimeda-discoidea.htm]''. In: Keoki Stender's Flora & Fauna ID Site [https://www.marinelifephotography.com/]
HALIMEDA INCRASSATA ''[https://www.marineplantbook.com/marinebookincrassata.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
Also known as ''Money plant'', this algae either grows in clumps or forms several branches. It requires [[calcium]] supplementation as it is calcified (making it a good food for clearing blockages in the digestive tracts of grazers) and a sand bed at least {{convert. 4. in. cm. 1
Halimeda (Monile/Incrassata) ''[https://www.reefcleaners.org/aquarium-store/plants-macroalgae/halimeda-monile-incrassata-detail]''. In: Reef Cleaners [https://www.reefcleaners.org/]
{{convert. 8. in. cm. 1
HALIMEDA OPUNTIA ''[https://www.marineplantbook.com/marinebookopuntia.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
This algae forms large mounds of tight segments and attaches itself to rocks and sand using several [[Holdfast (biology)
Carpeting Halimeda ''[https://www.reefcleaners.org/aquarium-store/plants-macroalgae/carpeting-halimeda-detail]''. In: Reef Cleaners [https://www.reefcleaners.org/]
Halimeda opuntia
Halimeda (Money Plant) ''[https://www.reefcleaners.org/aquarium-store/plants-macroalgae/halimeda-money-plant-detail]''. In: Reef Cleaners [https://www.reefcleaners.org/]
''Cactus algae'' is common on [[reefs]] and is amongst the most imported [[species]] of the ''[[Halimeda]]'' [[genus]] for aquariums. Though this algae can be housed under a wide range of lighting strengths, it grows best under Moderate-High lighting. It requires [[calcium]] supplementation as it is calcified, making it a good food for grazers (such as [[Acanthuridae
NEOMERIS ANNULATA ''[https://www.marineplantbook.com/marinebookneomeris.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
This species of spongy, fuzzy algae grows in small clusters or individually and spreads by extending its [[Holdfast (biology)
Neomeris Annulata ''[https://www.livealgae.co.uk/green-macroalgae-species/marine-macroalgae-neomeris-annulata]''. In: Livealgae UK [https://www.livealgae.co.uk/]
PENICILLUS CAPITATUS ''[https://www.marineplantbook.com/marinebookmermaidsbrush.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
PENICILLUS DUMETOSUS ''[https://www.marineplantbook.com/marinebookdumetosus.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
PENICILLUS PYRIFORMIS ''[https://www.marineplantbook.com/marinebookpyriformis.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
RHIPOCEPHALUS PHOENIX ''[https://www.marineplantbook.com/marinebookrhipocephalus.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
UDOTEA FLABELLUM ''[https://www.marineplantbook.com/marinebookmermaidsfan.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
(Saltwater fish) Seaweed Hagoromo (1) Hokkaido / Kyushu / Okinawa Airmail Insulation required ''[https://item.rakuten.co.jp/chanet/520822/]''. In: Rakuten Ichiba [https://www.rakuten.co.jp/?l2-id=shop_header_logo]
ENTEROMORPHA SP. ''[https://www.marineplantbook.com/marinebookenteromorpha.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
''Gutweed'' or ''Tube algae'' is common in both tropical and temperate waters. The algae forms tube-like [[Lamina (algae). blades]] secured by a single [[Holdfast (biology). holdfast]] to hard surfaces and [[Mangrove]] [[root]]s. In the aquarium, this algae should be kept in water temperatures under {{convert. 80. F. C. 1
ULVA SP. ''[https://www.marineplantbook.com/marinebookulva.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
''Sea lettuce'' is common in both [[tropical]] and [[temperate]] waters. The algae forms flat sheets which either anchor themselves with [[Holdfast (biology). holdfasts]] or float by trapping pearled air bubbles. Its growth rate is comparable to that of ''[[Chaetomorpha]]'', is nearly as popular, and is similarly good at absorbing excess nutrients in aquariums, housing microinvertebrates, and requires [[iron]] supplementation. It is usually kept in [[Refugium (fishkeeping)
Ulva flexuosa Wulfen, 1803 ''[https://www.marinespecies.org/aphia.php?p=taxdetails&id=234468]''. In: World Register of Marine Species: WoRMS [http://www.marinespecies.org/index.php]
Gut weed (Ulva intestinalis) ''[https://www.marlin.ac.uk/species/detail/1469]''. In: MarLIN - The Marine Life Information Network [https://www.marlin.ac.uk/]
Live Frag Stringy Ulva Intestinalis Sea Lettuce Marine Macro Algae Plant PICK A SIZE!!! ''[https://addictivereefkeeping.com/product/live-frag-stringy-ulva-intestinalis-sea-lettuce-marine-macro-algae-plant-pick-a-size/]''. In: Addictive Reef Keeping – Quality Products / Quality Livestock [https://addictivereefkeeping.com/]
Ulva Lactuca ''[https://www.livealgae.co.uk/green-macroalgae-species/marine-macroalgae-ulva-lactuca]''. In: Livealgae UK [https://www.livealgae.co.uk/]
This popular algae grows in ruffled, thin sheets which, in the event it does not feature a [[Holdfast (biology). {{convert. 24. in. cm. 1
VALONIA SP. ''[https://www.marineplantbook.com/marinebookvalonia.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
|| align="center" | Good || align="center" | High || align="center" | Moderate-High || align="center" | No || Also known as ''Sailor's eyeballs'', this algae is usually viewed as a pest, often entering aquariums on [[live rock]]. It has the ability to choke out [[corals]] if it grows too large and unfortunately, very few animals consume it (one of which is the ''Emerald crab'' ([[Mithraculus sculptus]])). They may be desirable in marine planted aquariums, however. The algae itself is comprised deep green, [[spore]] filled spheres.Valonia ''[https://www.melevsreef.com/critter/valonia]''. In: Melev's Reef [https://www.melevsreef.com]
: RED MACROALGAE (RHODOPHYTA) ''[https://www.marineplantbook.com/marineplantbookredalgae.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
ANCANTHOPHORA SPICIFERA ''[https://www.marineplantbook.com/marinebookspicifera.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
|| align="center" | Good || align="center" | Moderate-High || align="center" | Moderate-High || align="center" | Not really || This variable [[species]] comes in shades of red, yellow, purple, and green. Bright lighting brings out paler color while darker color is brought out by bluer lighting. Its structure consists of branches, finer and more compact than those of ''[[Laurencia]]''. The fast growing algae must be [[pruned]] regularly. Also known as ''Fire fern''.Acanthophora spicifera (Spiny Algae) ''[https://www.reefcleaners.org/store/out-of-season/acanthophora-spicifera-spiny-algae-detail]''. In: Reef Cleaners [https://www.reefcleaners.org/]
Green Agardhiella ''[https://www.reefcleaners.org/store/out-of-season/green-agardhiella-detail]''. In: Reef Cleaners [https://www.reefcleaners.org/]
Agardhiella ''[https://www.orafarm.com/product/agardhiella/]''. In: Oceans, Reefs & Aquariums: ORA [https://www.orafarm.com/]
{{convert. 12. in. cm. 1
Agardhiella subulata (C.Agardh) Kraft & M.J.Wynne, 1979 ''[https://www.marinespecies.org/aphia.php?p=taxdetails&id=145677]''. In: World Register of Marine Species: WoRMS [http://www.marinespecies.org/index.php]
Gracilaria Vermiculophylla ''[https://www.livealgae.co.uk/red-macroalgae-species/marine-macroalgae-gracilaria-vermiculophylla]''. In: Livealgae UK [https://www.livealgae.co.uk/]
|| align="center" | Good || align="center" | Moderate-High || align="center" | Moderate-High || align="center" | Somewhat || This is a hardy species suitable for [[marine aquaria]]. It develops darker coloration under lower intensity light and is best attached to rockwork with [[superglue]]. Once known as ''Gracilaria vermiculophylla'' and also commonly called ''black wart weed''.Gracilaria vermiculophylla (Ohmi) Papenfuss, 1967 ''[https://www.marinespecies.org/aphia.php?p=taxdetails&id=236157]''. In: World Register of Marine Species: WoRMS [http://www.marinespecies.org/index.php]
Agarophyton vermiculophyllum - Worm or Black Wart Weed ''[https://www.aphotomarine.com/red_seaweed_agarophyton_vermiculophyllum.html]''. In: A-P-H-O-T-O Wildlife Image Libraries [https://www.a-p-h-o-t-o.com/]
ASPARAGOPSIS TAXIFORMIS ''[https://www.marineplantbook.com/marinebookasparagopsis.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
BOTRYOCLADIA SP. ''[https://www.marineplantbook.com/marinebookbotryo.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
|| align="center" | Good || align="center" | Moderate || align="center" | Moderate || align="center" | Yes || This is a beautiful, hardy, highly palatable [[genus]] of [[macroalgae]] with several [[species]] available in the aquarium trade. It bears a resemblance to a cluster of [[grapes]], possessing stiff, lightly calcified branches covered in bright red [[pneumatocysts]]. Excessively high light will pale these [[pneumatocysts]]. Also known as ''Red berries'' as well as ''Red grape caulerpa'' despite not belonging in the ''[[Caulerpa]]'' [[genus]].Botryocladia - Red Grape ''[https://www.livealgae.co.uk/red-macroalgae-species/marine-macroalgae-botryocladia-red-grape]''. In: Livealgae UK [https://www.livealgae.co.uk/]
Botryocladia Botryoides Red Grape Macroalgae ''[https://www.plantedreef.co.uk/buy-macroalgae/Botryocladia-Botryoides-Red-Grape-Macroalgae-p133292619]''. In: PLANTED REEF [https://www.plantedreef.co.uk/]
|| align="center" | Moderate || align="center" | Low-Moderate || align="center" | || align="center" | YesRed Grape Caulerpa ''[https://www.saltybottomreefcompany.com/redgrape]''. In: Salty Bottom Reef Company [https://www.saltybottomreefcompany.com/]
Botryocladia botryoides (Wulfen) Feldmann, 1941 ''[https://www.marinespecies.org/aphia.php?p=taxdetails&id=145836]''. In: World Register of Marine Species: WoRMS [http://www.marinespecies.org/index.php]
(Saltwater fish) Seaweed Indonesian Red Grape Plants (1) Hokkaido Air Mail Insulation required ''[https://item.rakuten.co.jp/chanet/525458/]''. In: Rakuten Ichiba [https://www.rakuten.co.jp/?l2-id=shop_header_logo]
Botryocladia (Red Grape) ''[https://www.reefcleaners.org/store/out-of-season/botryocladia-red-grape-detail]''. In: Reef Cleaners [https://www.reefcleaners.org/]
|| align="center" | || align="center" | LowRed Grape Kelp (Botryocladia Occidentalis) ''[https://www.lowtidecorals.com/products/red-grape-kelp-botryocladia-occidentalis]''. In: LowTideCorals [https://www.lowtidecorals.com/]
Botryocladia skottsbergii ''[http://www.saltcorner.com/AquariumLibrary/browsespecies.php?CritterID=2087]''. In: Saltcorner [http://www.saltcorner.com/AquariumLibrary/browsesection.php]
Flame Algae ''[https://www.reefcleaners.org/store/out-of-season/flame-algae-detail]''. In: Reef Cleaners [https://www.reefcleaners.org/]
BRYOTHAMNION ''[https://pacificeastaquaculture.com/collections/macro-algae/products/bryothamnion]''. In: Pacific East Aquaculture [https://pacificeastaquaculture.com/]
Bryothamnion Triquetrum ''[https://www.livealgae.co.uk/red-macroalgae-species/marine-macroalgae-bryothamnion-triquetrum]''. In: Livealgae UK [https://www.livealgae.co.uk/]
Depending on lighting, ''Red razor'' may sport either a bright or deep red coloration. In the wild, the stiff, serrated algae grows in shaded environments with strong current. It is a great addition to a [[Seahorse]] tank as its [[Stipe (botany)
Patience by Sandra Shoup ''[http://reefkeeping.com/issues/2002-12/nftt/index.php]''. In: Reefkeeping Blog [http://reefkeeping.com/joomla/index.php/reefkeeping-blog]
Cotton Candy Algae ''[https://www.saltyunderground.com/article/52-cotton-candy-algae#:~:text=Cotton%20candy%20algae%20is%20classified,the%20other%20forms%20of%20algae.]''. In: Salty Underground [https://www.saltyunderground.com/]
{{convert. 4. in. cm. 1
Caulacanthus ustulatus ''[https://melevsreef.com/creature/algae-and-plants/caulacanthus-ustulatus]''. In: Melev's Reef [https://melevsreef.com/]
Caulacanthus ustulatus ''[http://southafrseaweeds.uct.ac.za/descriptions/red/caulacanthus_ustulatus.php]''. In: Seaweeds of the South African South Coast [http://southafrseaweeds.uct.ac.za/index.php]
CHONDRIA SP. ''[https://www.marineplantbook.com/marinebookchondria.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
Chondria Coerulescens Blue Algae Frag 1″ ''[https://addictivereefkeeping.com/product/chondria-coerulescens-blue-algae-frag-1/]''. In: Addictive Reef Keeping – Quality Products / Quality Livestock [https://addictivereefkeeping.com/]
HYDROLITHON SP. ''[https://www.marineplantbook.com/marinebookhydro.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
This order of red, calcified macroalgae is highly variable, taking on both [[Geniculate (alga). geniculate]] (branching) and [[nongeniculate]] (encrusting and plating) forms as well as a variety of colors, generally ranging from purple to pink. It often makes its way into aquariums through the introduction of live rock or wild caught [[Sea snail. snails]] and [[hermit crabs]] where they are highly desirable as a result of their attractive appearance and ability to outcompete nuisance algae for space. However, since ''Coralline algae'' readily attaches itself to hard surfaces, it can become problematic when it grows on glass and aquarium equipment as it is hard to remove due to its [[carbonate]] skeleton.CORALLINE ALGAE – THE ULTIMATE GUIDE ''[https://arcreef.com/live-rock/coralline-algae/]''. In: ARC Reef - Atlantic Reef Conservation [https://arcreef.com/]
Coralline ''[https://www.reefcleaners.org/coralline]''. In: Reef Cleaners - Clean up Crews and Macroalgae [https://www.reefcleaners.org/]
Coralline Algae: What Is It and Why Is It Important in Reef Tanks? ''[https://reefs.com/2020/02/08/coralline-algae-what-is-it-and-why-is-it-important-in-reef-tanks/]''. In: Reefs.com - Saltwater Aquarium Blog - Marine Aquarium Blog [https://reefs.com/]
Cryptonemia Crenulata ''[https://www.livealgae.co.uk/red-macroalgae-species/marine-macroalgae-cryptonemia-crenulata]''. In: Livealgae UK [https://www.livealgae.co.uk/]
|| align="center" | Poor || align="center" | Low-ModerateCryptonemia crenulata Macroalgae ''[https://www.plantedreef.co.uk/buy-macroalgae/Cryptonemia-crenulata-Macroalgae-p133292863]''. In: PLANTED REEF [https://www.plantedreef.co.uk/]
Cryptonemia crenulata (J.Agardh) J.Agardh, 1851 ''[https://www.marinespecies.org/aphia.php?p=taxdetails&id=145238]''. In: World Register of Marine Species: WoRMS [https://www.marinespecies.org/]
DASYA SP. ''[https://www.marineplantbook.com/marinebookdasya.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
Euchema spinosum ''[https://www.live-plants.com/eucheuma.htm]''. In: Gulf Coast Ecosystems [https://www.live-plants.com/index.htm]
EUCHEMA SPINOSUM ''[https://pacificeastaquaculture.com/collections/macro-algae/products/euchema-spinosum]''. In: Pacific East Aquaculture [https://pacificeastaquaculture.com/]
Eucheuma Spinosum macro care/What to expect ''[https://www.nano-reef.com/forums/topic/327078-eucheuma-spinosum-macro-carewhat-to-expect/]''. In: Nano-Reef Community [https://www.nano-reef.com/]
|| align="center" | || An incredibly difficult [[species]] of macroalgae to care for as it demands very stable, lower temperature environments and struggles to survive in small aquarium systems. It has a rubbery composition; comes in yellow, orange, and red colorations; and is made up of spiny branches and branchlets. Once known as ''Eucheuma spinosum''.Eucheuma denticulatum (N.L.Burman) Collins & Hervey, 1917 ''[http://www.marinespecies.org/aphia.php?p=taxdetails&id=213998]''. In: World Register of Marine Species: WoRMS [http://www.marinespecies.org/index.php]
GALAXAURA SP. ''[https://www.marineplantbook.com/marinebookgalaxaura.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
Pink Galaxy* ''[https://www.reefcleaners.org/store/out-of-season/pink-galaxy-detail]''. In: Reef Cleaners [https://www.reefcleaners.org/]
(Saltwater fish) Seaweed Indonesian Red Feather (1) Hokkaido / Kyushu / Okinawa Airmail Insulation required ''[https://item.rakuten.co.jp/chanet/47260/]''. In: Rakuten Ichiba [https://www.rakuten.co.jp/?l2-id=shop_header_logo]
GELIDIUM SP. ''[https://www.marineplantbook.com/marinebookgelidium.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
Fauchea Sp. ''[https://www.livealgae.co.uk/red-macroalgae-species/fauchea-sp-marine-macro-algae]''. In: Livealgae UK [https://www.livealgae.co.uk/]
|| align="center" | Poor || align="center" | Moderate-High || align="center" | Moderate-High || align="center" | Somewhat || A rare algae that occurs naturally as solitary individuals in depths upwards of 20 ft. It features serrated or rounded fronds with a metallic iridescence on its dorsal side and a reddish coloration on its ventral side; higher intensity lighting will make the algae more violet. It is best attached to rockwork with [[superglue]]. Smaller [[herbivores]] have difficulty consuming its thick [[thallus]].Fauchea Sp. ''[https://www.live-plants.com/fauchea.htm]''. In: Gulf Coast Ecosystems [https://www.live-plants.com/index.htm]
(Saltwater fish) Seaweed Yumigata Ogonori (1) Hokkaido / Kyushu / Okinawa Airmail Insulation required ''[https://item.rakuten.co.jp/chanet/525243/]''. In: Rakuten Ichiba [https://www.rakuten.co.jp/?l2-id=shop_header_logo]
{{convert. 4. in. cm. 1
Red Gracilaria ''[https://www.live-plants.com/gracilaria.htm]''. In: Gulf Coast Ecosystems [https://www.live-plants.com/index.htm]
Gracilaria Curtissae ''[https://www.livealgae.co.uk/red-macroalgae-species/marine-macroalgae-gracilaria-curtissae]''. In: Livealgae UK [https://www.livealgae.co.uk/]
Being a slow grower, ''Red bush ogo'' may take several weeks to develop a [[Holdfast (biology)
GRACILARIA HAYI ''[https://www.marineplantbook.com/marinebookgrachayi.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
This flame-like algae grows in the shape of a symmetrical, dense bush and may either attach to rocks with a [[Holdfast (biology)
Gracilaria hayi Gurgel, Fredericq & J.N.Norris, 2004 ''[https://www.marinespecies.org/aphia.php?p=taxdetails&id=376722]''. In: World Register of Marine Species: WoRMS [http://www.marinespecies.org/index.php]
Gracilaria Mammillaris ''[https://www.livealgae.co.uk/red-macroalgae-species/marine-macroalgae-gracilaria-mammillaris]''. In: Livealgae UK [https://www.livealgae.co.uk/]
|| align="center" | Fair || align="center" | Moderate || align="center" | Moderate-High || align="center" | Somewhat || This hardy algae grows reasonable quickly, rapidly attaching itself to substrate and other algae with its tendrils, and thus requires pruning. Individuals grow to form sheet-like plates that provide cover for [[copepods]] and [[rotifers]] and develop darker coloration under lower intensity light. It is also very rare in the [[marine aquarium]] trade.Red Mat Algae (Gracilaria Lauris) ''[https://www.lowtidecorals.com/products/copy-of-pom-pom-algae-gracilaria-hayi]''. In: LowTide Corals [https://www.lowtidecorals.com/]
Gracilaria Mammillaris Macroalgae ''[https://www.plantedreef.co.uk/buy-macroalgae/Gracilaria-mammillaris-Macroalgae-p429371390]''. In: PLANTED REEF [https://www.plantedreef.co.uk/]
GRACILARIA PARVISIPORA ''[https://www.marineplantbook.com/marinebookgracilariaparvis.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
This algae is characterized by long, cylindrical fronds and a single [[Holdfast (biology). holdfast]]. The coloration of an individual depends on the depth it was collected from (ranging from bright red to yellow or green). It is the most popular and one of the fastest growing of the red ''[[Gracilaria]]'' species in the aquarium trade and is hardy under a variety of conditions. It is also widely used in [[Refugium (fishkeeping)
Aquarium Fish, Corals, & More [https://www.liveaquaria.com/]
DRAGON’S TONGUE ''[https://www.algaebarn.com/shop/macroalgae/premium/dragons-tongue/]''. In: AlgaeBarn [https://www.algaebarn.com/]
Halymenia duchassaignii ''[http://www.saltcorner.com/AquariumLibrary/browsespecies.php?CritterID=2103]''. In: Saltcorner [http://www.saltcorner.com/AquariumLibrary/browsesection.php]
{{convert. 3. in. cm. 1
Halymenia Durvillei Dragons Breath ''[https://www.livealgae.co.uk/red-macroalgae-species/marine-macroalgae-halymenia-durvillei-dragons-breath]''. In: Livealgae UK [https://www.livealgae.co.uk/]
|| align="center" | Good || align="center" | Moderate-High || align="center" | Moderate-High || align="center" | Yes || This reddish algae has a soft composition (though more rigid and thicker than those of other members of its [[genus]]) with tips that will fluoresce a vibrant orange to yellow under moderately strong [[actinic]] lighting. It is highly popular, though it is often confused with other [[species]], such as ''[[Halymenia dilatata]]'' and ''[[Gracilaria hayi]]''. The algae grows in cycles and must be regularly split to be preserved.Live Dragon's Breath Fire Macro Algae Plant Frag Refugium Coral Reef Saltwater ''[https://www.ebay.com/itm/303401320703]''. In: eBay [https://www.ebay.com/]
Halymenia durvillei (Dragons Breath) ''[https://www.live-plants.com/dragonsbreath.htm]''. In: Gulf Coast Ecosystems [https://www.live-plants.com/index.htm]
Halymenia durvillei Bory de Saint-Vincent, 1828 ''[https://www.marinespecies.org/aphia.php?p=taxdetails&id=371236]''. In: World Register of Marine Species: WoRMS [http://www.marinespecies.org/index.php]
HALYMENIA ELONGATA ''[https://www.marineplantbook.com/marinebookhalymeniaelongata.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
HALYMENIA FLORESIA ''[https://www.marineplantbook.com/marinebookhalyfloresia.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
HALYMENIA FLORIDANA ''[https://www.marineplantbook.com/marinebookhalyfloridana.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
Halymenia Maculata ''[https://www.livealgae.co.uk/red-macroalgae-species/marine-macroalgae-halymenia-maculata]''. In: Livealgae UK [https://www.livealgae.co.uk/]
This popular and vibrant [[species]] features stiff, blotchy purplish-light red to deep red [[Lamina (algae). blades]], based on lighting conditions (however, it will turn grey under excessively high intensity light). Additionally, it is highly palatable to larger [[herbivorous]] [[fish]] and makes for a good [[Refugium (fishkeeping). refugium]] addition. In the wild, it is found in [[subtidal]], [[coral reef. reef-associated]] regions of the [[Indian Ocean
Flamingo Feather Algae ''[https://www.reefcleaners.org/store/out-of-season/flamingo-feather-algae-detail]''. In: Reef Cleaners [https://www.reefcleaners.org/]
|| align="center" | HighHetereosiphona gibessii ''[https://www.live-plants.com/H.Gibessii.htm]''. In: Gulf Coast Ecosystems [https://www.live-plants.com/index.htm]
Hildenbrandia rubra (Sommerfelt) Meneghini, 1841 ''[https://www.marinespecies.org/aphia.php?p=taxdetails&id=145712]''. In: World Register of Marine Species: WoRMS [http://www.marinespecies.org/index.php]
Blue Hypnea: The Next Hot Refugium Macro? ''[https://www.algaebarn.com/blog/advanced/blue-hypnea-the-next-hot-refugium-macro/]''. In: AlgaeBarn [https://www.algaebarn.com/]
|| align="center" | || align="center" | Moderate-HighBlue Hypnea (Hypnea pannosa) ''[https://www.orafarm.com/product/blue-hypnea/]''. In: Oceans, Reefs & Aquariums: ORA [https://www.orafarm.com/]
Pink Segmented Algae - Jania spp ''[https://tropicalfishplus.com/collections/algaes/products/pink-segmented-algae-jania-spp]''. In: Tropical Fish Plus [https://tropicalfishplus.com/]
HALIPTILON SP. ''[https://www.marineplantbook.com/marinebookredfern.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
|| align="center" | Fair || align="center" | Moderate-High || align="center" | Moderate || align="center" | Somewhat || This popular genus of macroalgae grows calcified branches with fern shaped blades and has a red or pink coloration. It can be found growing on live rock and some species are [[epiphytic]] and grow on other algae. Most species in this genus are [[temperate]] water species yet they can tolerate warmer temperatures. Also known as ''Smooth kelp'' and was once known as ''[[Haliptilon]]''.Haliptilon (Decaisne) Lindley, 1846 ''[https://www.marinespecies.org/aphia.php?p=taxdetails&id=144010]''. In: World Register of Marine Species: WoRMS [http://www.marinespecies.org/index.php]
Jania rubens ''[https://www.live-plants.com/jania.htm]''. In: Gulf Coast Ecosystems [https://www.live-plants.com/index.htm]
LAURENCIA SP. ''[https://www.marineplantbook.com/marinebooklaurencia.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
LIAGORA SP. ''[https://www.marineplantbook.com/marinebookliagora.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
LITHOPHYLLUM SP. ''[https://www.marineplantbook.com/marinebooklitho.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
NEMASTOMA SP. ''[https://www.marineplantbook.com/marinebooknemastoma.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
OCHTODES SP. ''[https://www.marineplantbook.com/marinebookochtodes.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
|| align="center" | Good || align="center" | Moderate-High || align="center" | Moderate || align="center" | Somewhat || This highly adaptable algae is one of only a few with purple-blue coloration in the aquarium trade and is incredible popular. Usually, it grows in spurts, alternating between overgrowing its environment and dying back within the course of several weeks. In the wild, the algae grows on hard surfaces or as an [[epiphyte]] in shallow water.The Best Planted Aquascape I have Ever Done | Marine Macroalgae Lagoon Planted Reef 3 Year Update ''[https://www.youtube.com/watch?v=3i4UaAOCP-k]''. In: YouTube [https://www.youtube.com/]
Peyssonnelia sp. ''[http://www.saltcorner.com/AquariumLibrary/browsespecies.php?CritterID=2127]''. In: Saltcorner [http://www.saltcorner.com/AquariumLibrary/browsesection.php]
Purple Laver (Porphyra ssp.) ''[https://gulfofme.com/all-sea-life/purple-laver-porphyra-ssp]''. In: Gulf of Maine, Inc.. Marine Science [https://gulfofme.com/]
Live Portieria Red Macro Rare Algae Alga Plant Reef Refugium Coral Saltwater ''[https://www.ebay.com/itm/303997883128]''. In: eBay [https://www.ebay.com/]
Portieria ''[https://www.live-plants.com/portieria.htm]''. In: Gulf Coast Ecosystems [https://www.live-plants.com/index.htm]
(Saltwater fish) Seaweed Kinuhada (1 bunch) Hokkaido / Kyushu / Okinawa Airmail Insulation required ''[https://item.rakuten.co.jp/chanet/525324/]''. In: Rakuten Ichiba [https://www.rakuten.co.jp/?l2-id=shop_header_logo]
|| align="center" | Yes || ''Silk skin'' grows in deeper regions of the [[intertidal zone]] and is best viewed under lighting with red and blue wavelength lamps. The algae grows as a single cloth-like frond which does not branch finely and should be handled with care due to its delicate nature. Once known as ''Callophyllis okamurae''.Callophyllis okamurae P.C.Silva, 1987 ''[https://www.marinespecies.org/aphia.php?p=taxdetails&id=372206]''. In: World Register of Marine Species: WoRMS [http://www.marinespecies.org/index.php]
This challenging species demands stable water parameters and should not be excessively handled due to its fragility. It grows in red to pink, gelatinous clumps. If the algae is in poor health, this may indicate that it requires [[iodine]] supplementation. [[Crabs]] and [[Acanthuridae
Scinaia hormoides ''[http://www.reefsanctuary.com/forum/index.php?media/scinaia-hormoides.5916/]''. In: Reef Sanctuary [http://www.reefsanctuary.com/forum/index.php]
{{convert. 3. in. cm. 1
Solieria spp. ''[https://www.livealgae.co.uk/red-macroalgae-species/solieria-spp-red-bamboo-macro-algae]''. In: Livealgae UK [https://www.livealgae.co.uk/]
Aquarium Fish, Corals, & More [https://www.liveaquaria.com/]
TRICHOGLOEA SP ''[https://www.marineplantbook.com/marinebookribbon.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
: MANGROVES ''[https://www.marineplantbook.com/marineplantbookmangrove.htm]''. In: Marine Plants in the Aquarium [https://www.marineplantbook.com/]
(2012). "The 'Living' Marine Aquarium Manual Basic And Advanced Husbandry For The 'Modern' Marine Aquarium". Salt Corner.

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