HomeCompare fishBlack neon tetra vs Red phantom tetra Black neon tetra vs Red phantom tetra: can they live together? Verdict: CompatibleBoth are comfortable at 23–25°C (73–77°F).A pH of 5.5–7.5 suits both.Minimum tank for the pair: 75 L (20 US gal)Side by sideBlack neon tetraRed phantom tetraAdult size3.2 cm (1.3 in)4 cm (1.6 in)Minimum tank75 L (20 US gal)55 L (15 US gal)Temperature23–28°C (73–82°F)22–25°C (72–77°F)pH5.5–7.55.5–7.5Hardness2–15 dGH (36–268 ppm)4–20 dGH (71–357 ppm)TemperamentPeacefulPeacefulCommunity tankExcellentExcellentCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesBlack neon tetraHyphessobrycon herbertaxelrodiRed phantom tetraHyphessobrycon sweglesi