HomeCompare fishRedtail splitfin vs Gulf gambusia Redtail splitfin vs Gulf gambusia: can they live together? Verdict: With cautionThe Redtail splitfin can be semi-aggressive or nip fins.Both are comfortable at 22–25°C (72–77°F).A pH of 6.5–7.8 suits both.Minimum tank for the pair: 75 L (20 US gal)Side by sideRedtail splitfinGulf gambusiaAdult size6 cm (2.4 in)5 cm (2 in)Minimum tank75 L (20 US gal)20 L (5 US gal)Temperature15–32°C (59–90°F)22–25°C (72–77°F)pH6.0–8.06.5–7.8Hardness9–19 dGH (161–339 ppm)–TemperamentSemi-aggressive–Community tankGoodGoodCare levelEasy–DietOmnivoreOmnivoreSpecies profilesRedtail splitfinXenotoca eiseniGulf gambusiaGambusia vittata