I have a f.p. clown that has been really ill lately. He is swimming upside down (when he swims at all), he has lost alot of his color, he is not eating, and he is hiding out under a rock. I have four other inhabitants of the tank, another f.p. clown, a dwarf rusty angelfish, a cardinal, and a scooter. The tank is about 30 gallons with a dual bio-wheel (not sure what else it is called). There is about 15-20 lbs of live rock in the tank as well. All levels have tested to be wonderful and the other fish are doing great. However, I did have a camel shrimp die earlier today. The f.p. clown has no spots or lesions or any such markings, just lost his color and looks like he's ready to lay down and die. I need help fast, can't lose my nemo!!