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Shoal & Stem

Flora & Fauna

673 entries — care guides, placement tips, and notes from the community

fish
medium

Figure Eight Puffer

Dichotomyctere ocellatus

fishbrackish

Small, characterful puffer with a figure-eight pattern on its back. Prefers slightly brackish water. Personality-packed fish that recognises its keeper. Will eat snails and hard-shelled foods.

plant
medium

Fine-leaved Pondweed

Potamogeton gayi

plantfreshwater

Elegant plant with very fine, grass-like submerged leaves. Creates a soft, wispy texture perfect for natural-style aquascapes. Tolerates cool water well and can be used in temperate tanks.

coral
medium

Fire Coral

Millepora alcicornis

coralsaltwater

A hydrozoan rather than a true coral — branching, blade-like, or encrusting forms in mustard-yellow. Delivers a potent sting, even to humans. Fast-growing and found on shallow, high-flow reef crests.

shrimp
easy

Fire Shrimp

Lysmata debelius

shrimpsaltwater

Striking blood-red with white-spotted antennae — one of the most beautiful marine shrimp. Acts as a cleaner shrimp, setting up stations where fish visit to have parasites removed. Best kept in pairs.

fish
easy

Firefish Goby

Nemateleotris magnifica

fishsaltwater

Elegant dartfish with a fiery orange-red tail and white-to-yellow body. Shy but beautiful. Tends to jump so a tight-fitting lid is essential.

fish
medium

Firemouth Cichlid

Thorichthys meeki

fishfreshwater

The firemouth cichlid is named for the vivid red-orange colouration on the throat and belly. It is a moderately aggressive Central American cichlid that pairs for breeding and defends territories. A stunning fish when in breeding colour.

plant
hard

Fissidens Nobilis

Fissidens nobilis

plantfreshwater

Premium aquatic moss with large, firm fronds resembling tiny ferns. Grows slowly but produces a striking, almost sculptural texture unlike any other moss. Attach to rock or wood; requires high flow and clean water.

fish
moderate

Flagtail Corydoras

Corydoras robineae

fishfreshwater

The flagtail corydoras is one of the most striking species in the genus, with a spectacular tiger-striped caudal fin that resembles a waving flag. The body is pale with a single dark stripe through the eye. A prized species among corydoras enthusiasts, it prefers soft, acidic blackwater conditions matching its Rio Negro origin.

fish
medium

Flame Angelfish

Centropyge loricula

fishsaltwater

Vivid red-orange dwarf angelfish with black vertical bars. One of the most popular dwarf angels. May nip at corals; monitor in reef tanks.

fish
easy

Flame Hawkfish

Neocirrhites armatus

fishsaltwater

Vivid red with black dorsal markings and outline — perches atop gorgonians and Acropora waiting to ambush prey. Completely reef-safe with corals but will eat small shrimp. Charismatic and bold.

plant
easy

Flame Moss

Taxiphyllum sp. 'Flame'

plantfreshwater

Flame Moss gets its name from the way its upright, twisted stems spiral and curve upward — resembling flickering orange flames when viewed in flowing water. Unlike most mosses that grow laterally, Flame Moss grows vertically, making it uniquely suited for mid-height mounding effects on rocks and wood. It is slow growing but compact, rarely requiring trimming, and stays tidy in low-flow areas.

fish
easy

Florida Flagfish

Jordanella floridae

fishfreshwater

Stunning killifish native to Florida whose flanks mimic the American flag. Hardy algae-eater that tolerates cool water. Great for subtropical and unheated tanks.

fish
easy

Flowerhorn Cichlid

Hybrid cichlid

fishfreshwater

Distinctive man-made hybrid cichlid with a prominent nuchal hump (kok). Extremely hardy but highly aggressive — must be kept alone. Develops a strong bond with its keeper.

fish
intermediate

Forest Betta

Betta pugnax

fishfreshwater

The Penang Betta or Forest Betta is a paternal mouthbrooder from clearwater forest streams in Peninsular Malaysia. It is one of the earliest Betta species to be scientifically described and has been kept by hobbyists for over a century. Males display brown-grey bodies with metallic green scale edging and elongated ventral fins. Less showy than newer cultivars, it is valued by wild betta enthusiasts for its natural behaviour and interesting breeding process.

fish
easy

Forktail Rainbowfish

Pseudomugil furcatus

fishfreshwater

Beautiful nano rainbowfish with a distinctive forked tail with yellow-and-black markings. Males display intensely to each other. Perfect for planted nano tanks.

plant
easy

Four-Leaf Clover Plant

Marsilea quadrifolia

plantfreshwater

The four-leaf clover aquatic fern produces charming four-lobed leaves that resemble tiny clover on short stalks. It can be grown as a compact foreground carpet in high-light CO2 tanks, or left to grow taller as a decorative mid-ground plant in low-tech setups. A unique texture plant that adds whimsy to any scape.

fish
easy

Foxface Rabbitfish

Siganus vulpinus

fishsaltwater

Bold yellow body with intricate brown-and-white facial patterning. Has venomous spines so handle carefully. Outstanding algae and nuisance weed grazer.

coral
medium

Frogspawn Coral

Euphyllia divisa

coralsaltwater

Frogspawn Coral is a popular LPS coral whose branching skeleton terminates in clusters of rounded, grape-like polyp tips that sway mesmerisingly in gentle water movement — resembling a mass of frog eggs. It is one of the three classic Euphyllia corals (alongside Hammer and Torch) and shares their care requirements. It has potent sweeper tentacles that can sting corals placed nearby, so adequate spacing within the reef aquarium is essential.

fish
medium

Frontosa Cichlid

Cyphotilapia frontosa

fishfreshwater

The frontosa is a majestic Lake Tanganyika cichlid with a distinctive nuchal hump and striking black-and-white vertical banding. It is a slow-moving predator that is surprisingly peaceful for its size in large colonies. A showpiece fish for large Tanganyika setups.

coral
medium

Fungia Plate Coral

Fungia spp.

coralsaltwater

Fungia plate corals are unusual free-living LPS corals that rest on the sandbed and can slowly move to find better conditions. They have a single large mouth surrounded by numerous short tentacles and come in a range of colours. They are sensitive to being placed on rough substrates.

fish
medium

Furcata Rainbowfish

Pseudomugil furcatus

fishfreshwater

Furcata rainbowfish are small, jewel-like fish with males sporting vivid yellow fins edged in black. They are highly active swimmers and look spectacular in planted nano tanks with dense vegetation. They need very small foods and calm tankmates.

algae
easy

Fuzz Algae

Stigeoclonium sp.

algaefreshwater

Short, fuzzy green tufts — typically 2–5 mm — that appear on the edges of plant leaves, hardscape, and equipment. One of the most common algae in newly planted tanks. Easily grazed by Amano shrimp, Otocinclus, and nerite snails. Caused by light excess or inconsistent CO₂ early in a tank's life. Usually resolves as the tank matures.

coral
medium

Galaxea Coral

Galaxea fascicularis

coralsaltwater

Galaxea is a large-polyp stony coral with star-shaped polyps that extend long sweeper tentacles at night, capable of stinging corals several centimetres away. It is a fast grower under good conditions but requires significant space between it and neighbours.

fish
easy

Galaxy Koi Betta

Betta splendens 'Galaxy Koi'

fishfreshwater

Galaxy Koi Bettas are among the most visually complex cultivars, displaying a mosaic of multi-coloured patches — white, orange, black, and metallic blue or green — resembling the marbled pattern of koi fish. The galaxy pattern refers to an additional iridescent metallic sheen overlaid on the koi marbling. Each fish is unique; no two Galaxy Koi Bettas look exactly the same.

fish
easy

Gardneri Killifish

Fundulopanchax gardneri

fishfreshwater

One of the most popular and colourful killifish. Males display vivid blue-green with red spots. Hardy and readily available. Perfect introduction to the killifish hobby.

fish
hard

German Blue Ram

Mikrogeophagus ramirezi

fishfreshwater

The German blue ram is a strikingly coloured dwarf cichlid demanding pristine water quality and warm, soft, acidic conditions. It forms monogamous pairs and will defend a small territory during breeding. Sensitive to poor water quality and temperature fluctuations, making regular water changes critical.

shrimp
easy

Ghost Shrimp

Palaemonetes paludosus

shrimpfreshwater

Ghost shrimp are nearly transparent freshwater shrimp often sold as feeder animals, though they make excellent, inexpensive nano tank inhabitants in their own right. They consume algae, debris, and uneaten food, contributing to tank cleanliness. However, they are sometimes aggressive toward smaller shrimp species.

plant
medium

Giant Ambulia

Limnophila aquatica

plantfreshwater

Lush, feathery stem plant with large whorls of finely divided leaves. Fast-growing background plant that creates a spectacular bushy effect. Needs good light and CO2.

plant
easy

Giant Baby Tears

Micranthemum umbrosum

plantfreshwater

Baby Tears or Pearl Grass, this cheerful stem plant produces tiny, round, bright green leaves and grows fast even without CO2. Ideal for mid-ground mounds or as a floating plant for shrimp tanks. Often confused with HC Cuba but its leaves are larger and it is far more tolerant of low-tech conditions.

plant
easy

Giant Bacopa

Bacopa amplexicaulis

plantfreshwater

A larger Bacopa species with distinctive clasping (amplexicaul) leaves that wrap around the stem at the base. The blue-violet flowers it produces above the waterline are among the most attractive of any aquarium plant. Submerged leaves are broad and light green, giving it a lush, robust appearance. Grows quickly and is very adaptable — excellent as an emersed pond margin plant or fully submerged background plant.

fish
intermediate

Giant Betta

Betta splendens 'Giant'

fishfreshwater

The Giant Betta is a selectively bred line of Betta splendens that can reach 12–14 cm in length — roughly twice the size of standard bettas. Despite their size, they require the same care as regular bettas but demand more space and food. The giant gene is recessive and was developed in Thailand through multi-generation line breeding.

fish
easy

Giant Danio

Devario aequipinnatus

fishfreshwater

The giant danio lives up to its name among danios, reaching up to 10 cm. It is a fast, active schooling fish with vivid blue-yellow horizontal stripes. Peaceful with most community fish but may outcompete slow or small tankmates for food.

fish
easy

Giant Gourami

Osphronemus goramy

fishfreshwater

The largest labyrinth fish, reaching 24 inches. Despite its size, generally peaceful and even shy. Develops a real personality — will hand-feed and recognise its owner. A long-term commitment.

plant
easy

Giant Hairgrass

Eleocharis montevidensis

plantfreshwater

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.

snail
easy

Giant Ramshorn Snail

Marisa cornuarietis

snailfreshwater

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.

plant
hard

Giant Red Rotala

Rotala macrandra

plantfreshwater

Rotala Macrandra is widely regarded as one of the most beautiful red plants in the hobby, with broad, crinkled leaves that turn vibrant crimson under optimal conditions. It is also one of the most demanding stem plants, requiring very high light, injected CO2, intensive macro and micro nutrient dosing, and soft acidic water — any deficiency quickly manifests as yellowing or failure to colour up. Rewarding for experienced planted tank keepers.