I have 3 angels, 2 large and one small, in a community tank. The large ones always leave the small one alone and haven't really fought eachother until a few days ago (I've had them for a year). Its terrible. The larger angel hides and the other will chase him from his cave and attack relentlessly. My larger angel has a chunk of scales missing, one of his front fins is almost gone, and his other fins are frayed. I don't have another tank available to separate them. Could I add some dither fish like danios to disperse the aggression? I've been feeding a lot of frozen meaty foods... is that causing this sudden aggression? Should I stop? Should I take any precautions like adding aquarium salt or medicine to prevent infection because of the missing scales? Thanks in advance!