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Two ways into the reference
Start from the kind of fish you want, or from what your tank and water can give.
Tetras & rasborasPeaceful shoaling fish for planted community tanks.18 species →LivebearersGuppies, platies and mollies that bear live young.7 species →CatfishCorydoras, plecos and other bottom-dwelling catfish.12 species →LoachesEel-shaped bottom-dwellers, many shy and nocturnal.5 species →Bettas & gouramisLabyrinth fish, many happy in smaller tanks.7 species →CichlidsIntelligent, often territorial fish needing space.11 species →BarbsActive, often nippy shoalers that need company.5 species →Danios & minnowsHardy, active shoalers, many for cooler water.4 species →RainbowfishColourful, active shoalers from Australia and New Guinea.4 species →KillifishColourful, often short-lived egg-layers for planted tanks.1 species →HatchetfishSurface-dwelling shoalers with a distinctive deep body.1 species →PuffersIntelligent little oddballs with real personality and a bite.1 species →Gobies & gudgeonsSmall, characterful bottom-dwellers with big personalities.1 species →Coldwater & goldfishCool-water species for unheated or temperate tanks.4 species →Shrimp & snailsPeaceful invertebrates that graze algae.8 species →
Beginner-friendlyHardy species that tolerate a newcomer’s early mistakes.11 species →Community tankPeaceful fish that mix well in a general aquarium.60 species →Nano tankSmall fish and inverts for tanks under about 40 litres.21 species →Bottom dwellersCatfish and loaches that work the substrate.18 species →Planted tanksSpecies that suit a planted, well-lit setup.23 species →Hard waterSpecies that thrive in mineral-rich tap water.8 species →Soft waterSpecies that need softer, often more acidic water.24 species →Cool water / unheatedSpecies that suit cooler or unheated tanks.11 species →