HomeCompare fishFlame tetra vs Red phantom tetra Flame tetra vs Red phantom tetra: can they live together? Verdict: CompatibleBoth are comfortable at 22–25°C (72–77°F).A pH of 5.8–7.5 suits both.Minimum tank for the pair: 55 L (15 US gal)Side by sideFlame tetraRed phantom tetraAdult size4.5 cm (1.8 in)4 cm (1.6 in)Minimum tank55 L (15 US gal)55 L (15 US gal)Temperature22–28°C (72–82°F)22–25°C (72–77°F)pH5.8–7.85.5–7.5Hardness5–25 dGH (89–446 ppm)4–20 dGH (71–357 ppm)TemperamentPeacefulPeacefulCommunity tankGoodExcellentCare levelDifficultEasyDietOmnivoreOmnivoreSpecies profilesFlame tetraHyphessobrycon flammeusRed phantom tetraHyphessobrycon sweglesi