Hi! was wondering if anyone could help me. I have two female platys which Ive had for a month or so. Theyve got on well but today one started being aggressive towards the other, nipping and ramming. Ive just noticed that the one being attacked has white poo. could she be ill? could this be why the other female platy is being aggressive? my tank other then that is all fine, 0 for nitrites and ammonia, nitrates r about 15. thanks in adavnce for any help!!