Hello. I have recently bought 3 male fancy guppies, 3 female sunburst platies, and 3 ghost shrimp ( unfortunately the biggest one died today ). The fish were all good the day of and after being put in the tank. It wasn't until day 3 that I noticed that one of my guppies had a new hole in it's tail and I got worried. I'm still not sure who bit him because it seems to happen overnight. At first I thought it was one of the other male guppies but none seem to show signs of agression. I did notice yesterday that one of the female platies was nipping at the other females. This morning I noticed that the male guppy that was being nip has about half of it's tail gone! I'm getting really worried and I don't wanna wait another day because something might happen ( knock on wood ). What do you guys think I do about this. Could it be the platy that's nipping at the guppy or can it be the ghost shrimp scretely targeting their victims at night? Plz help and thanks. P.S. The other two non-nipping platies have a little nip on their tail.