Just after I feed the fishies this AM, an outright war broke out with my 4 tiger barbs. Not just chasing each other as normal but an nose to nose, mouth locking battle. Not just one on one but a free for all with, at one time, three of them locked up to with each other. This went on, with different combinations, for about a couple of minutes until my Acie broke it up. He likes a peaceful tank and at 4 inches he pretty much co-rules the tank with the Red Tail. Of course now the TB's are the best of friends. A couple of noses look a little red but nothing serious. I love my barbs. The four of them have been with me since they were babes.