HomeCompare fishBrilliant rasbora vs Slim betta Brilliant rasbora vs Slim betta: can they live together? Verdict: With cautionThe Slim betta can be semi-aggressive or nip fins.Both are comfortable at 24–26°C (75–79°F).A pH of 6.5 suits both.Minimum tank for the pair: 110 L (29 US gal)Side by sideBrilliant rasboraSlim bettaAdult size9 cm (3.5 in)10 cm (3.9 in)Minimum tank110 L (29 US gal)75 L (20 US gal)Temperature22–26°C (72–79°F)24–30°C (75–86°F)pH6.0–6.56.5–7.5Hardness–5–15 dGH (89–268 ppm)TemperamentPeacefulSemi-aggressiveCommunity tankGoodGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesBrilliant rasboraRasbora einthoveniiSlim bettaBetta bellica