HomeCompare fishBrilliant rasbora vs Harlequin rasbora Brilliant rasbora vs Harlequin rasbora: can they live together? Verdict: With cautionThe Brilliant rasbora grows about twice as long as the Harlequin rasbora; watch for bullying or predation.Both are comfortable at 22–25°C (72–77°F).A pH of 6.0–6.5 suits both.Minimum tank for the pair: 110 L (29 US gal)Side by sideBrilliant rasboraHarlequin rasboraAdult size9 cm (3.5 in)4 cm (1.6 in)Minimum tank110 L (29 US gal)55 L (15 US gal)Temperature22–26°C (72–79°F)22–25°C (72–77°F)pH6.0–6.55.0–7.0Hardness–5–12 dGH (89–214 ppm)TemperamentPeacefulPeacefulCommunity tankGoodExcellentCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesBrilliant rasboraRasbora einthoveniiHarlequin rasboraTrigonostigma heteromorpha