Hello, I've had my community tank for a few months now and went on holiday for a week to find that my red wagtail platy had been nipped quite a lot and has become very very skinny! I definitely know who's behind the nipping etc (my other blue male platy), but I've now moved the red platy to his own 5 gallon tank to recover and am wondering if anyone can tell me how I can help him? To me it almost looks like a case of parasites as he's become super thin over the course of a week but he's still eating and his poo is normal. Could the sudden loss of weight be caused by stress alone? I can't figure out how to post pictures so if anyone could help me out with that as well, that would be appreciated!!