HomeCompare fishDwarf rainbowfish vs Black ghost Dwarf rainbowfish vs Black ghost: can they live together? Verdict: Not recommendedThe Black ghost is aggressive towards other fish.An adult Black ghost is about 10 times the length of a Dwarf rainbowfish and may eat it.Both are comfortable at 23–28°C (73–82°F).A pH of 6.5–7.5 suits both.Side by sideDwarf rainbowfishBlack ghostAdult size5 cm (2 in)50 cm (20 in)Minimum tank150 L (40 US gal)210 L (55 US gal)Temperature22–28°C (72–82°F)23–28°C (73–82°F)pH6.5–7.56.0–8.0Hardness8–18 dGH (143–321 ppm)5–10 dGH (89–178 ppm)TemperamentPeacefulAggressiveCommunity tankGoodGoodCare levelEasyModerateDietOmnivoreOmnivoreSpecies profilesDwarf rainbowfishMelanotaenia praecoxBlack ghostApteronotus albifrons