HomeCompare fishFlame tetra vs Flag tetra Flame tetra vs Flag tetra: can they live together? Verdict: CompatibleBoth are comfortable at 22–28°C (72–82°F).A pH of 5.8–7.5 suits both.Minimum tank for the pair: 55 L (15 US gal)Side by sideFlame tetraFlag tetraAdult size4.5 cm (1.8 in)3.4 cm (1.3 in)Minimum tank55 L (15 US gal)55 L (15 US gal)Temperature22–28°C (72–82°F)22–28°C (72–82°F)pH5.8–7.85.5–7.5Hardness5–25 dGH (89–446 ppm)5–15 dGH (89–268 ppm)TemperamentPeacefulPeacefulCommunity tankGoodGoodCare levelDifficultModerateDietOmnivoreOmnivoreSpecies profilesFlame tetraHyphessobrycon flammeusFlag tetraHyphessobrycon heterorhabdus