HomeCompare fishHead-and-taillight tetra vs Black phantom tetra Head-and-taillight tetra vs Black phantom tetra: can they live together? Verdict: CompatibleBoth are comfortable at 22–26°C (72–79°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 phantom tetraAdult size5 cm (2 in)4 cm (1.6 in)Minimum tank75 L (20 US gal)75 L (20 US gal)Temperature22–26°C (72–79°F)22–28°C (72–82°F)pH6.0–8.06.0–7.5Hardness5–19 dGH (89–339 ppm)2–18 dGH (36–321 ppm)TemperamentPeacefulPeacefulCommunity tankExcellentExcellentCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesHead-and-taillight tetraHemigrammus ocelliferBlack phantom tetraHyphessobrycon megalopterus