One of my angelfish beat up the other, why?????
I have had these angelfish for a pretty long time, at least a year. They were bigger when I got them they are about 4x5 now, pretty much the same size. They are in a 50 gallon with some peaceful fish and they have been fine and gotten along great until yesterday. They are siblings after all. The one was harassing and chasing the other one all over the place, I didn't think much of it until now right after feeding them and seeing the damage inflicted. he has scales missing all over the place and his fins are all shredded. He isn't looking so great....what should I do? I am not sure if it was a breeding attempt that didn't go well or if they are both males or what? Any ideas? I haven't had adult angels before so I am not sure what their behaviors are or how to classify this incident. Should I take him out of the tank or what?