HomeCompare fishBlackline rasbora vs Coppernose barb Blackline rasbora vs Coppernose barb: can they live together? Verdict: Not recommendedThe Coppernose barb is aggressive towards other fish.An adult Coppernose barb is about 4 times the length of a Blackline rasbora and may eat it.Both are comfortable at 22–26°C (72–79°F).A pH of 6.5–7.0 suits both.Side by sideBlackline rasboraCoppernose barbAdult size5 cm (2 in)17.5 cm (6.9 in)Minimum tank115 L (30 US gal)115 L (30 US gal)Temperature22–26°C (72–79°F)22–26°C (72–79°F)pH6.5–7.06.5–7.0Hardness5–12 dGH (89–214 ppm)5–10 dGH (89–178 ppm)TemperamentPeacefulAggressiveCommunity tankExcellentWith cautionCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesBlackline rasboraRasbora borapetensisCoppernose barbRaiamas christyi