Okay guys what causes a fish to do this. Today I bought some more live rock for my tank and decided to rearrange a few things. So I moved some of the rock around, which stirred up some dust. About 30 minutes later after the dust had settled I was watching and my yellow tail damsel was swimming as normal an then all of a sudden dive bombed a piece of rock sat there for a second and then went back to normal like nothing happened. All Was well until about 30 minutes ago during feeding. I drop some food in he comes out of his cave as normal to eat then start swimming in circles like he is chasing his tail, swims straight up, dive bombs the ground, goes back into the cave and never ate. I'm a little concerned at the moment. He looks fine, good color, no sign of parasites.