I have a 29 gallon saltwater tank. Everything is fine. In the tank I have 2 damsels....a yellow tailed and a blue devil.(& some hermit crabs) I have had the tank a little over 2 years. Both fish as well. Both fish were fine this morning and when I came home today after lunch, I noticed my yellow tailed damsel at the bottom breathing heavily. He is still breathing heavily and tries to move around every now and then. Does ANYONE know anything that might be wrong? His color is fine and there is nothing on him. The other fish is fine. Is it his time to go? Just out of the blue this happened. I would appreciate any help anyone has to give me. I consider pets as humans and would appreciate any help anyone could give me. Thanks......Khrystie