HomeCompare fishGiant danio vs Blackline rasbora Giant danio vs Blackline rasbora: can they live together? Verdict: With cautionThe Giant danio grows about twice as long as the Blackline rasbora; watch for bullying or predation.Both are comfortable at 22–25°C (72–77°F).A pH of 6.5–7.0 suits both.Minimum tank for the pair: 210 L (55 US gal)Side by sideGiant danioBlackline rasboraAdult size10 cm (3.9 in)5 cm (2 in)Minimum tank210 L (55 US gal)115 L (30 US gal)Temperature21–25°C (70–77°F)22–26°C (72–79°F)pH6.0–8.06.5–7.0Hardness5–19 dGH (89–339 ppm)5–12 dGH (89–214 ppm)TemperamentPeacefulPeacefulCommunity tankGoodExcellentCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesGiant danioDevario aequipinnatusBlackline rasboraRasbora borapetensis