HomeCompare fishBlack neon tetra vs Lemon tetra Black neon tetra vs Lemon tetra: can they live together? Verdict: CompatibleBoth are comfortable at 23–28°C (73–82°F).A pH of 5.5–7.5 suits both.Minimum tank for the pair: 75 L (20 US gal)Side by sideBlack neon tetraLemon tetraAdult size3.2 cm (1.3 in)5 cm (2 in)Minimum tank75 L (20 US gal)75 L (20 US gal)Temperature23–28°C (73–82°F)22–28°C (72–82°F)pH5.5–7.55.5–8.0Hardness2–15 dGH (36–268 ppm)3–25 dGH (54–446 ppm)TemperamentPeacefulPeacefulCommunity tankExcellent–Care levelEasyEasyDietOmnivoreOmnivoreSpecies profilesBlack neon tetraHyphessobrycon herbertaxelrodiLemon tetraHyphessobrycon pulchripinnis