so I’ve had a purple tang in a 75 gallon reef tank for about 2 months and i tried to add a small bristle tooth tang to my tank. The purple tang chased it around for a bit so I removed the bristle tooth tang and put him into a smaller aquarium and he’s happy now. However, I’ve now noticed spots on my purple tang and I figure ich may have arisen from the fiasco with the bristle tooth. He’s still behaving normally but isn’t eating as much. He is a large healthy fat fish so im not sure whether to pull him and treat him or see if he gets over it. Any suggestions?