HomeCompare fishHead-and-taillight tetra vs Black neon tetra Head-and-taillight tetra vs Black neon tetra: can they live together? Verdict: CompatibleBoth are comfortable at 23–26°C (73–79°F).A pH of 6.0–7.5 suits both.Minimum tank for the pair: 75 L (20 US gal)Side by sideHead-and-taillight tetraBlack neon tetraAdult size5 cm (2 in)3.2 cm (1.3 in)Minimum tank75 L (20 US gal)75 L (20 US gal)Temperature22–26°C (72–79°F)23–28°C (73–82°F)pH6.0–8.05.5–7.5Hardness5–19 dGH (89–339 ppm)2–15 dGH (36–268 ppm)TemperamentPeacefulPeacefulCommunity tankExcellentExcellentCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesHead-and-taillight tetraHemigrammus ocelliferBlack neon tetraHyphessobrycon herbertaxelrodi