HomeFreshwater aquarium fishGuppies & livebearersRedtail splitfin Redtail splitfin (Xenotoca eiseni) Scientific name: Xenotoca eiseni Rutter, 1896 The Redtail splitfin (Xenotoca eiseni) is a freshwater fish of the family Goodeidae that grows to about 6 cm (2.4 in). It is easy to keep and semi-aggressive, suits community aquariums and needs a tank of at least 75 L (20 US gal), water at 15–32°C (59–90°F) and a pH of 6.0–8.0. Native range: North America, Rio of Santiago, Rio Tamazula and Tuxpan, Mexico. Redtail splitfin care at a glanceCare levelEasyTemperamentSemi-aggressiveCommunity tankGoodAdult size6 cm (2.4 in)Minimum tank75 L (20 US gal)Temperature15–32°C (59–90°F)pH6.0–8.0Hardness9–19 dGH (161–339 ppm)DietOmnivore. Accepts flakes, wafers, frozen foods and live foods. Species factsScientific nameXenotoca eiseniFamilyGoodeidae (Splitfins)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length6.0EnvironmentFreshwater;; pH range: 6.0 - 8.0; dH range: 9 - 19 demersalClimateTemperateDistributionCentral America: Mexico.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesAquarium: commercial More guppies & livebearersBlackbarred limiaLimia nigrofasciataMosquitofishGambusia affinisSailfin mollyPoecilia latipinnaGuppyPoecilia reticulataGreen swordtailXiphophorus helleriiSouthern platyfishXiphophorus maculatusSee all guppies & livebearers Can it live with...?Redtail splitfin and Black ghostRedtail splitfin and Black sharkminnowRedtail splitfin and Blackbarred limiaRedtail splitfin and Bleeding-heart tetraRedtail splitfin and Bloodfin tetraRedtail splitfin and Bluespotted corydorasRedtail splitfin and Bluetail goodeaRedtail splitfin and Bold characodonRedtail splitfin and Brilliant rasboraRedtail splitfin and Butterfly splitfinRedtail splitfin and Chinese suckerRedtail splitfin and Clown barbRedtail splitfin and Clown loachRedtail splitfin and Clown rasboraRedtail splitfin and Crescent bettaRedtail splitfin and Dwarf botiaRedtail splitfin and Dwarf rainbowfishRedtail splitfin and Eel LoachRedtail splitfin and Forktail rainbowfishRedtail splitfin and Gangetic leaffishRedtail splitfin and Garnet tetraRedtail splitfin and Glass catfishRedtail splitfin and Glowlight tetraRedtail splitfin and Goldeneye cichlidRedtail splitfin and Gulf gambusiaRedtail splitfin and Head-and-taillight tetraRedtail splitfin and Horseface loachRedtail splitfin and Indian glassy fishRedtail splitfin and Lake Kutubu rainbowfishRedtail splitfin and Lampeye panchax 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