HomeCompare fishHead-and-taillight tetra vs Flame tetra Head-and-taillight tetra vs Flame tetra: can they live together? Verdict: CompatibleBoth are comfortable at 22–26°C (72–79°F).A pH of 6.0–7.8 suits both.Minimum tank for the pair: 75 L (20 US gal)Side by sideHead-and-taillight tetraFlame tetraAdult size5 cm (2 in)4.5 cm (1.8 in)Minimum tank75 L (20 US gal)55 L (15 US gal)Temperature22–26°C (72–79°F)22–28°C (72–82°F)pH6.0–8.05.8–7.8Hardness5–19 dGH (89–339 ppm)5–25 dGH (89–446 ppm)TemperamentPeacefulPeacefulCommunity tankExcellentGoodCare levelEasyDifficultDietOmnivoreOmnivoreSpecies profilesHead-and-taillight tetraHemigrammus ocelliferFlame tetraHyphessobrycon flammeus