HomeCompare fishLake Kutubu rainbowfish vs Blackfin pearlfish Lake Kutubu 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 20–24°C (68–75°F).A pH of 7.0 suits both.Side by sideLake Kutubu rainbowfishBlackfin pearlfishAdult size10 cm (3.9 in)7 cm (2.8 in)Minimum tank210 L (55 US gal)55 L (15 US gal)Temperature20–24°C (68–75°F)18–24°C (64–75°F)pH7.0–8.06.0–7.0Hardness9–12 dGH (161–214 ppm)5–12 dGH (89–214 ppm)TemperamentPeacefulAggressiveCommunity tankGoodNot suitableCare levelEasyModerateDietOmnivoreCarnivoreSpecies profilesLake Kutubu rainbowfishMelanotaenia lacustrisBlackfin pearlfishAustrolebias nigripinnis