HomeCompare fishForktail rainbowfish vs Head-and-taillight tetra Forktail rainbowfish vs Head-and-taillight tetra: can they live together? Verdict: CompatibleBoth are comfortable at 24–26°C (75–79°F).A pH of 6.0–8.0 suits both.Minimum tank for the pair: 75 L (20 US gal)Side by sideForktail rainbowfishHead-and-taillight tetraAdult size5 cm (2 in)5 cm (2 in)Minimum tank75 L (20 US gal)75 L (20 US gal)Temperature24–26°C (75–79°F)22–26°C (72–79°F)pH6.0–8.06.0–8.0Hardness5–12 dGH (89–214 ppm)5–19 dGH (89–339 ppm)TemperamentPeacefulPeacefulCommunity tankGoodExcellentCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesForktail rainbowfishPseudomugil furcatusHead-and-taillight tetraHemigrammus ocellifer