HomeCompare fishDwarf rainbowfish vs Black sharkminnow Dwarf rainbowfish vs Black sharkminnow: can they live together? Verdict: Not recommendedAn adult Black sharkminnow is about 18 times the length of a Dwarf rainbowfish and may eat it.Both are comfortable at 24–27°C (75–81°F).A pH of 6.5–7.5 suits both.Side by sideDwarf rainbowfishBlack sharkminnowAdult size5 cm (2 in)90 cm (35 in)Minimum tank150 L (40 US gal)475 L (125 US gal)Temperature22–28°C (72–82°F)24–27°C (75–81°F)pH6.5–7.56.5–7.5Hardness8–18 dGH (143–321 ppm)2–15 dGH (36–268 ppm)TemperamentPeacefulPeacefulCommunity tankGoodGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesDwarf rainbowfishMelanotaenia praecoxBlack sharkminnowLabeo chrysophekadion