Well, the headline says most of what is the problem. I've had my tank set up for maybe 10 months now. I have had my pair of percula clowns for a while, and my filefish for about 2 1/2 months. They have never had a problem until a couple days ago. I haven't changed anything for weeks now, I have basically just been letting the tank sit. The filefish has his own little cave area where he stays, but sometimes he ventures out, and the clowns get on him, they have eaten a little piece of his tail off. And now the filefish just stays in his designated cave zone, only coming out for food. Not sure what to do, but if anyone has a suggestion it'd be appreciated. 
