HomeCompare fishForktail rainbowfish vs Mosquitofish Forktail rainbowfish vs Mosquitofish: can they live together? Verdict: With cautionThe Mosquitofish can be semi-aggressive or nip fins.Both are comfortable at 24–26°C (75–79°F).A pH of 6.0–8.0 suits both.Minimum tank for the pair: 75 L (20 US gal)Side by sideForktail rainbowfishMosquitofishAdult size5 cm (2 in)4 cm (1.6 in)Minimum tank75 L (20 US gal)40 L (11 US gal)Temperature24–26°C (75–79°F)12–29°C (54–84°F)pH6.0–8.06.0–8.0Hardness5–12 dGH (89–214 ppm)5–19 dGH (89–339 ppm)TemperamentPeacefulSemi-aggressiveCommunity tankGoodGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesForktail rainbowfishPseudomugil furcatusMosquitofishGambusia affinis