Flora & Fauna
673 entries — care guides, placement tips, and notes from the community
Giant Hairgrass
Eleocharis montevidensis
The tallest commonly kept Eleocharis species, producing stiff, dark green needle-like blades up to 30–50 cm tall. Creates a dramatic, grass-like background that mimics riparian meadows. Unlike dwarf hairgrasses, it does not form a dense carpet but instead grows as individual clumps. Very undemanding and one of the few Eleocharis that thrives without CO₂ injection. Excellent for paludarium setups or tall tanks where vertical structure is desired.
Giant Ramshorn Snail
Marisa cornuarietis
The Giant Ramshorn (Colombian Ramshorn) is a large, impressive snail with a distinctive flat, coiled shell striped in brown and cream — reaching up to 5 cm — distinguishing it from the smaller true ramshorn (Planorbarius). Unlike many ornamental snails it has a voracious appetite for aquatic plants and should not be kept in planted aquariums; it is best suited to fish-only or utilitarian setups where its algae and detritus grazing is beneficial. It reproduces readily in freshwater.
Glowlight Tetra
Hemigrammus erythrozonus
The glowlight tetra has a warm golden-orange iridescent stripe running the full body length, glowing like an ember in a planted tank. It is a peaceful, attractive schooling fish that pairs beautifully with dark substrates and dense planting.
Gold Medaka
Oryzias latipes var.
Golden selective line of the Japanese ricefish. Suitable for ponds, outdoor tubs, and nano tanks. Extremely tough and easy to breed. Females carry egg clusters before releasing to plants.
Gold Mystery Snail
Pomacea bridgesii var.
Vivid golden-yellow form of the mystery snail. Active and personable — visually striking against dark substrates. Peaceful algae and detritus grazer. Lays eggs above the waterline so populations are easy to control.
Gold Tetra
Hemigrammus rodwayi
The gold tetra has a distinctive golden-yellow sheen to the body caused by a parasitic infection the fish experiences in the wild — this actually produces the attractive gold iridescence that hobbyists prize. Tank-bred specimens often lack the intense gold but retain a pleasant iridescence. A peaceful, undemanding schooling fish.
Golden Pencilfish
Nannostomus beckfordi
Hardy, golden-bodied pencilfish with a bold red-and-black lateral stripe. The most adaptable pencilfish — tolerates a wider pH range than most. Great for beginner planted tanks.
Grape Caulerpa
Caulerpa racemosa
Creeping runners bearing upright branches tipped with small spherical beads — resembling tiny bunches of grapes. One of the most vigorous nutrient-exporting macroalgae; grows rapidly in refugia. Can go sexual and crash if left unharvested for too long. Listed as invasive in the Mediterranean.
Green Chromis
Chromis viridis
The quintessential schooling reef fish — shimmering apple-green in open water above Acropora. Incredibly hardy and peaceful. Best kept in groups of 6+ for the most natural look.
Green Jade Shrimp
Neocaridina davidi var.
Opaque jade-green Neocaridina with excellent colour contrast in planted tanks. Rarer than the red and blue variants. As hardy and prolific as all other Neocaridina — a great addition to any shrimp collection.
Green Jade Shrimp
Neocaridina davidi var. 'Green Jade'
Green jade shrimp are a selectively bred Neocaridina variety with an opaque mint-green colour. Like all Neocaridina they are hardy and tolerate a wider range of water conditions than Caridina. Their unique green colouration is particularly striking against dark substrate.
Guppy
Poecilia reticulata
Guppies are hardy, colourful livebearers that reproduce readily in captivity. Males display elaborate tails and body patterns to attract females. They adapt to a wide range of water conditions, though clean, well-filtered water is essential to prevent fin disease.
Guppy Grass
Najas guadalupensis
Known as Guppy Grass or Najas Grass, this fast-growing, fine-leaved plant is a superb filtration plant and spawning medium. It floats freely or can be weighted down. Its vigorous growth absorbs excess nutrients, helping combat algae. Very tolerant of a wide range of water conditions.
Hairy Marsilea
Marsilea hirsuta
Marsilea Hirsuta is a low-maintenance carpet plant that produces small, clover-like leaves on short stems. It spreads via runners to form a lush, medium-height green carpet without requiring CO2 injection — making it one of the easiest carpet plants for low-tech tanks. Leaves grow taller without CO2 but stay compact with it.
Halimeda
Halimeda sp.
Attractive calcified green macroalgae with segmented, coin-like lobes. Grows upright and anchors into sandbed or live rock. Naturally calcified — contributes to calcium demand. Fish tend to leave it alone. Adds a natural look to the display tank and provides nutrient export.
Harlequin Rasbora
Trigonostigma heteromorpha
The harlequin rasbora is recognised by the distinctive black triangular patch on its rear half set against a copper-orange body. Hardy, peaceful, and active in the midwater, it pairs beautifully with planted tanks.
Honey Gourami
Trichogaster chuna
The Honey Gourami is one of the most peaceful labyrinth fish in the hobby — males develop a rich golden-honey coloration with an orange-red throat and belly when in breeding condition. At 4–5 cm it fits comfortably in nano and small community tanks. Less prone to disease than the Dwarf Gourami and considerably more tolerant of soft, acidic water, making it an excellent alternative for low-tech planted setups.
Horned Nerite Snail
Clithon corona
The Horned Nerite is a small, striking nerite species notable for its ornate shell decorated with irregular blunt horn-like protrusions that vary in number, length, and arrangement between individuals — no two are quite alike. Like other nerites it is an excellent algae grazer and cannot reproduce in freshwater, so populations remain controlled. The unusual shell adds unique sculptural texture to planted tanks and nano aquariums.
Hornwort
Ceratophyllum demersum
Hornwort is one of the most adaptable aquatic plants available, surviving in a wide range of conditions from cold ponds to tropical tanks. It requires no substrate and can float or be anchored. It grows rapidly, absorbing nutrients, and provides excellent cover for fry.
Horsefaced Loach
Acantopsis dialuzona
Elongated loach with a distinctive long snout for sifting sand. Spends much of its time buried with just its eyes visible. Peaceful and an excellent sand-bed cleaner.
Hydrocotyle Japan
Hydrocotyle sp. 'Japan'
A compact variant of pennywort that produces small, neatly round, bright green leaves on short stems. Unlike the faster-growing H. tripartita, it has a more controlled growth habit and can be used as a delicate foreground or mid-ground filler. It adapts readily to CO2 and non-CO2 tanks alike.
Hygrophila 'Bold'
Hygrophila sp. 'Bold'
A robust cultivar with unusually wide, wavy-edged leaves that give a bold, architectural presence in the background. The large leaf surface collects bubbles during pearling, making it a favourite for photography. Very easy to grow and tolerant of low-tech conditions.
Hygrophila 'Sunset'
Hygrophila sp. 'Sunset'
A variegated cultivar with creamy white, pink, and green patterning on the leaves — the colours intensify under stronger light. A favourite in Dutch and community planted tanks for adding colour without the difficulty of true red plants. Stays compact and bushy with regular trimming.
Hygrophila Angustifolia
Hygrophila angustifolia
A narrow-leaved Hygrophila with long, willowy green leaves held in whorls along upright stems. Grows faster than most Hygrophila species and provides a graceful, flowing texture in the background. The fine leaf texture contrasts well with broad-leaved plants like Anubias or Cryptocoryne. Easy to grow in most conditions — one of the few Hygrophilas that maintains its narrow, elegant leaf form even in low tech.
Hygrophila Corymbosa Compact
Hygrophila corymbosa 'Compact'
A cultivar of the Temple Plant with shorter internodal spacing, producing a denser, bushier plant than the standard species. Large, bright green leaves are held close to the stem, giving it a robust, architectural look in the midground or background. One of the easiest stem plants to grow — thrives in low-tech tanks and is very forgiving of neglect. A great beginner plant that still looks impressive in mature scapes.
Hygrophila Siamensis 53B
Hygrophila siamensis '53B'
A compact, attractive cultivar of Hygrophila siamensis with narrower, slightly undulated leaves that are bright green on top and pale on the underside. Very hardy and fast growing, it works well as a mid-background filler and helps suppress algae through nutrient uptake. Trims well and stays bushy.
Hypnea
Hypnea musciformis
Wiry, reddish-brown branching macroalgae that tangs and rabbitfish readily consume. Grows quickly and provides excellent nutrient export in refugia. Attaches loosely to rubble and rock. One of the most palatable macroalgae for herbivorous reef fish — can be offered directly as live food.
Indian Waterweed
Hygrophila polysperma
The quintessential beginner stem plant — grows rapidly in almost any conditions without CO2. Under high light the leaves take on a pink hue. Excellent as a background filler or for fishrooms and breeding tanks.
Ivory Mystery Snail
Pomacea bridgesii var.
Solid white-cream form of the mystery snail — looks like a tiny porcelain ornament. One of the most elegant snail colour forms. Effective detritus cleaner that adds a clean aesthetic to planted tanks.
Jack Dempsey
Rocio octofasciata
Bold, iridescent cichlid covered in electric blue-green spots. Named for the aggressive boxer. One of the most popular American cichlids — easier to keep than its aggressive reputation suggests.
Jania
Jania rubens
Feathery, pinkish-white tufts of jointed calcified branches — a beautiful encrusting coralline relative that forms soft mats on rockwork. Provides habitat for tiny amphipods and copepods. A common and welcome hitchhiker on Mediterranean and Atlantic live rock. Tolerates cooler water than most corallines.
Japanese Cress
Cardamine lyrata
Delicate stem plant with rounded, lobed leaves on long stems. Prefers cool water — one of the best plants for temperate and coldwater aquascapes. Sends floating leaves to the surface when established.
Japanese Ricefish
Oryzias latipes
Tiny, peaceful fish from Japanese rice paddies. Extremely cold-tolerant — one of the few fish that can be kept outdoors year-round in temperate climates. Egg-hanger that's easy to breed.
Japanese Trapdoor Snail
Cipangopaludina japonica
The Japanese Trapdoor Snail is a large, attractive freshwater snail with a smooth, olive-green to dark-brown rounded shell and a distinctive calcareous operculum (trapdoor) that seals the shell opening when the snail retreats. It is a peaceful, slow-moving scavenger and algae grazer well suited to ponds and large aquariums. Unlike mystery snails, it is livebearing and gives birth to miniature snails without an egg-laying stage.
Java Fern
Microsorum pteropus
Java fern is one of the most forgiving aquatic plants, thriving under low light without CO2 injection. It must be attached to hardscape rather than planted in substrate, as burying the rhizome will cause it to rot. New plantlets emerge from the edges of mature leaves, making propagation effortless.
Java Fern Narrow Leaf
Microsorum pteropus 'Narrow Leaf'
Java Fern Narrow Leaf is a cultivar of the standard Java Fern with significantly narrower, lance-shaped leaves that create a finer, more graceful texture in aquascapes. It reaches 20–30 cm in height and works beautifully as a midground plant where a more delicate silhouette is desired. Care is identical to regular Java Fern — attach to hardscape, never bury the rhizome, and it will grow steadily under low to medium light.