HomeCompare fishRed rainbowfish vs Garnet tetra Red rainbowfish vs Garnet tetra: can they live together? Verdict: With cautionThe Red rainbowfish grows about twice as long as the Garnet tetra; watch for bullying or predation.Their preferred pH ranges don't overlap.Both are comfortable at 23–25°C (73–77°F).Minimum tank for the pair: 150 L (40 US gal)Side by sideRed rainbowfishGarnet tetraAdult size12 cm (4.7 in)5 cm (2 in)Minimum tank150 L (40 US gal)55 L (15 US gal)Temperature22–25°C (72–77°F)23–27°C (73–81°F)pH7.0–8.05.0–6.0Hardness9–19 dGH (161–339 ppm)5–12 dGH (89–214 ppm)TemperamentPeacefulPeacefulCommunity tankGoodExcellentCare levelEasy–DietOmnivoreOmnivoreSpecies profilesRed rainbowfishGlossolepis incisusGarnet tetraHemigrammus pulcher