HomeFreshwater aquarium fishTetras & characinsGreen neon tetra Green neon tetra (Paracheirodon simulans) Scientific name: Paracheirodon simulans G?ry, 1963 The Green neon tetra (Paracheirodon simulans) is a freshwater fish of the family Characidae that grows to about 2.5 cm (1 in). It is peaceful, suits community aquariums and needs a tank of at least 55 L (15 US gal), water at 20–26°C (68–79°F) and a pH of 5.5–6.5. Native range: South America, ATupari and Jufaris rivers, Brazil. Green neon tetra care at a glanceTemperamentPeacefulCommunity tankGoodAdult size2.5 cm (1 in)Minimum tank55 L (15 US gal)Temperature20–26°C (68–79°F)pH5.5–6.5DietOmnivore Species factsScientific nameParacheirodon simulansFamilyCharacidae (Characins)OrderCharaciformes (Characins)ClassActinopterygii (Ray-finned fishes)Maximum length2.0EnvironmentFreshwater;; pH range: 5.5 - 6.0; dH range: ? - 4 pelagicClimateTropicalDistributionSouth America: Upper Negro and Orinoco River basins.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesAquarium: commercialResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) More tetras & characinsBlack morpho tetraPoecilocharax weitzmaniGlass bloodfinPrionobrama filigeraGlass tetraMoenkhausia oligolepisRoyal tetraInpaichthys kerriRosy tetraHyphessobrycon rosaceusStriped pike-characinBoulengerella lateristrigaSee all tetras & characins SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0. Aquarium care parameters compiled, checked and converted to metric and imperial units by Guppies.za.net.Last updated 28 September 2026