HomeCompare fishDwarf rainbowfish vs Blackfin pearlfish Dwarf rainbowfish vs Blackfin pearlfish: can they live together? Verdict: Not recommendedThe Blackfin pearlfish is best kept in a species tank.The Blackfin pearlfish is aggressive towards other fish.Both are comfortable at 22–24°C (72–75°F).A pH of 6.5–7.0 suits both.Side by sideDwarf rainbowfishBlackfin pearlfishAdult size5 cm (2 in)7 cm (2.8 in)Minimum tank150 L (40 US gal)55 L (15 US gal)Temperature22–28°C (72–82°F)18–24°C (64–75°F)pH6.5–7.56.0–7.0Hardness8–18 dGH (143–321 ppm)5–12 dGH (89–214 ppm)TemperamentPeacefulAggressiveCommunity tankGoodNot suitableCare levelEasyModerateDietOmnivoreCarnivoreSpecies profilesDwarf rainbowfishMelanotaenia praecoxBlackfin pearlfishAustrolebias nigripinnis