yellow tag

Hey all, so I’ve had this yellow tang in my tank since September 25,2021 he’s been doing great eats both the frozen food and algae I put in the tank. I recently introduced a fire fish and sand sifting goby late December who are also eating well. Today I noticed these marks on my tang, none of my...

I recently purchased a yellow tang, and QT in copper for 1 month before adding him to my display. He was out and eating well for about a week. On Monday however, he was hiding in the rocks all day. The past few days he has been hiding the entire time, but will come out to eat brine shrimp. There...