I have had a clown tang for several months now in my 300gal with 2 maroon gold bar clowns, a tomato clown, a naso tang, and a few damsels. I just came home to find my clown tang kind of lying on the sand/rocks at the bottom/front of my tank. She seems to be able to swim just fine if she wants to, but she just keeps wedging herself into the rocks. I tried feeding, and she was the only fish that didn't go for the food. The naso tang keeps to a different area of the tank and the clown tang is the bigger of the two fish, so I don't think that they are fighting each other. All the other fish are perfectly fine. I don't see any marks on the outside of her body, and her fins only have a little ich on them (I have several cleaner shrimp in the tank and she visits them often). She may have slightly gill movement, but I don't really know what counts as fast. I just tested my levels, and my ammonia is slightly high (.5ppm), but Nitrates and Nitrites are both 0. I would normally assume that she was trying to find a place to sleep, but it is the middle of the day and the tank lights are all on. Please help!