I have a small yellow tang and he has been acting weird in the last few days... He is going back and forth along the front window. Kind of rubbing the wall or dancing or twitching... I don't know how to call it! He does not do that against the rocks or anything... He eats very well. And there is no marks on him. No white spots. Nothing... He seems to be breathing a little fast but I am not a 100% percent sure. Maybe because he's so worked up! During the night, he goes to sleep in the rocks and stops his little "dance". I don't really know what to do... I tried to catch him and put him in my quarantine but he is impossible to catch!! I've got 70lbs of rocks with corals, etc and he's the fastest little thing. What should I do? Thanks!