HomeCompare fishDwarf rainbowfish vs Head-and-taillight tetra Dwarf rainbowfish vs Head-and-taillight tetra: can they live together? Verdict: CompatibleBoth are comfortable at 22–26°C (72–79°F).A pH of 6.5–7.5 suits both.Minimum tank for the pair: 150 L (40 US gal)Side by sideDwarf rainbowfishHead-and-taillight tetraAdult size5 cm (2 in)5 cm (2 in)Minimum tank150 L (40 US gal)75 L (20 US gal)Temperature22–28°C (72–82°F)22–26°C (72–79°F)pH6.5–7.56.0–8.0Hardness8–18 dGH (143–321 ppm)5–19 dGH (89–339 ppm)TemperamentPeacefulPeacefulCommunity tankGoodExcellentCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesDwarf rainbowfishMelanotaenia praecoxHead-and-taillight tetraHemigrammus ocellifer