HomeCompare fishCrescent betta vs Mosquitofish Crescent betta vs Mosquitofish: can they live together? Verdict: With cautionThe Mosquitofish can be semi-aggressive or nip fins.Both are comfortable at 24–29°C (75–84°F).A pH of 6.0–7.0 suits both.Minimum tank for the pair: 40 L (11 US gal)Side by sideCrescent bettaMosquitofishAdult size6 cm (2.4 in)4 cm (1.6 in)Minimum tank40 L (11 US gal)40 L (11 US gal)Temperature24–30°C (75–86°F)12–29°C (54–84°F)pH6.0–7.06.0–8.0Hardness5–19 dGH (89–339 ppm)5–19 dGH (89–339 ppm)TemperamentPeacefulSemi-aggressiveCommunity tankGoodGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesCrescent bettaBetta imbellisMosquitofishGambusia affinis