I have 2 clown fish and everything was great in the tank until yesterday 1 of the clowns did not go after the food like it normaly does. It also seems to have isolated its self from the other fish (my 5 fish seem to hang together in the tank) Its been swiming in about the same spot. (this morning i noticed it at the other side of the tank I noticed this large piece of fieces (light in color) hanging out of the fish. (at least thats what it looked like) I have read that they can get constipated and that they exhibit this type of behavior when they do so. In addition i have read that if the fish is changing sex it may act different. All water levels are good and all other fish are eating and swiming very well.