One of my rosy barbs has a very pink gill plate, dark guts and a split tail which appears to be going dark where it's split. It had a split tail when brought it (didn't notice) Tank checks out ok (i.e 28C, pH 7,GH 6, NH 0, NO 0) She's in with 7 other girls 1 male rosy barbs, 4 kuili loachs, 3 clown loachs and 5 b/n plecos. Would like to leave her in the tank as even my quarintine/breeding tank is full. Whats wrong with her and how do I treat it. Cheers