HomeFreshwater aquarium fishRainbowfish & killifishRed-Tailed Silverside Red-Tailed Silverside (Bedotia geayi) Scientific name: Bedotia geayi Pellegrin, 1907 The Red-Tailed Silverside (Bedotia geayi) is a freshwater fish of the family Bedotiidae that grows to about 10 cm (3.9 in). It is difficult to keep and peaceful, suits community aquariums and needs a tank of at least 210 L (55 US gal), water at 20–24°C (68–75°F) and a pH of 7.0–8.0. Native range: Africa, Streams in Madagascar. Red-Tailed Silverside care at a glanceCare levelDifficultTemperamentPeacefulCommunity tankGoodAdult size10 cm (3.9 in)Minimum tank210 L (55 US gal)Temperature20–24°C (68–75°F)pH7.0–8.0Hardness9–19 dGH (161–339 ppm)DietOmnivore BiologyOccurs in coastal rivers, up to an altitude of 500 m.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameBedotia geayiFamilyBedotiidae (Madagascar rainbowfishes)OrderAtheriniformes (Silversides)ClassActinopterygii (Ray-finned fishes)Maximum length9.0EnvironmentFreshwater;; pH range: 7.0 - 8.0; dH range: 9 - 19 pelagicClimateTropicalDistributionAfrica: eastern Madagascar.Conservation status (IUCN)Vulnerable (VU)(B1ab(i,ii,iii)+2ab(i,ii,iii))Threat to humansHarmlessUsesAquarium: commercial More rainbowfish & killifishTwostripe lyretailAphyosemion bivittatumLyretail panchaxAphyosemion australeCelebes rainbowfishMarosatherina ladigesiCelebes rainbowTelmatherina celebensisMarmorated medakaOryzias marmoratusArgentine pearlfishAustrolebias bellottiiSee all rainbowfish & killifish 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