it just started recently. I had my tank up and running at school. Came home for 4 days, left an automatic feeder on the tank, however it didn't work. I returned to a fish that had been eaten (yellow damsel), I moved the tank home and since the move the 4 stripe has become even worse. It was fine before but now it's bad, and it only picks on the one fish. The blue isolates itself in the top corners of the tank instead of in the rocks and leaves itself open as a target. It's tail is gone and it's chewed up it's back. It was my 1st fish, it's what cycled my tank and it survived and now it's hard to let it go.