Hello, I just purchased a powder brown tang today. I observed it at the store and saw it was eating a lot and very healthy. I purchased him home and he is doing well and getting use to the new home. He is still eating and swimming. However, I just noticed what looks like a large white cyst on the right side under the gills. I do not recall if it had it at the store or not. It doesn't seemt o bother him and he's swimming and eating and he is not breathing fast or hard. He's just gradually swimming in the tank. I took a picture of it. It is that round spot in the white area under his fins/gills... Can you tell if this is a disease or if it looks like anything that I should be worried about.
