HomeCompare fishHead-and-taillight tetra vs Redtail splitfin Head-and-taillight tetra vs Redtail splitfin: can they live together? Verdict: With cautionThe Redtail splitfin can be semi-aggressive or nip fins.Both are comfortable at 22–26°C (72–79°F).A pH of 6.0–8.0 suits both.Minimum tank for the pair: 75 L (20 US gal)Side by sideHead-and-taillight tetraRedtail splitfinAdult size5 cm (2 in)6 cm (2.4 in)Minimum tank75 L (20 US gal)75 L (20 US gal)Temperature22–26°C (72–79°F)15–32°C (59–90°F)pH6.0–8.06.0–8.0Hardness5–19 dGH (89–339 ppm)9–19 dGH (161–339 ppm)TemperamentPeacefulSemi-aggressiveCommunity tankExcellentGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesHead-and-taillight tetraHemigrammus ocelliferRedtail splitfinXenotoca eiseni