HomeCompare fishRed rainbowfish vs Black sharkminnow Red rainbowfish vs Black sharkminnow: can they live together? Verdict: Not recommendedAn adult Black sharkminnow is about 8 times the length of a Red rainbowfish and may eat it.Both are comfortable at 24–25°C (75–77°F).A pH of 7.0–7.5 suits both.Side by sideRed rainbowfishBlack sharkminnowAdult size12 cm (4.7 in)90 cm (35 in)Minimum tank150 L (40 US gal)475 L (125 US gal)Temperature22–25°C (72–77°F)24–27°C (75–81°F)pH7.0–8.06.5–7.5Hardness9–19 dGH (161–339 ppm)2–15 dGH (36–268 ppm)TemperamentPeacefulPeacefulCommunity tankGoodGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesRed rainbowfishGlossolepis incisusBlack sharkminnowLabeo chrysophekadion