HomeCompare fishFlame tetra vs Black phantom tetra Flame tetra vs Black phantom tetra: can they live together? Verdict: CompatibleBoth are comfortable at 22–28°C (72–82°F).A pH of 6.0–7.5 suits both.Minimum tank for the pair: 75 L (20 US gal)Side by sideFlame tetraBlack phantom tetraAdult size4.5 cm (1.8 in)4 cm (1.6 in)Minimum tank55 L (15 US gal)75 L (20 US gal)Temperature22–28°C (72–82°F)22–28°C (72–82°F)pH5.8–7.86.0–7.5Hardness5–25 dGH (89–446 ppm)2–18 dGH (36–321 ppm)TemperamentPeacefulPeacefulCommunity tankGoodExcellentCare levelDifficultEasyDietOmnivoreOmnivoreSpecies profilesFlame tetraHyphessobrycon flammeusBlack phantom tetraHyphessobrycon megalopterus