So I have this powder blue tang who is currently in a qt tank with two anthias, and a tiny hippo tang. They are being treated for ich with cupramine. We are a few day away from the end of their treatment when a white line showed up on his side with a bit on his fin... it lines up perfectly. I was thinking that maybe he and the hippo got into it a bit but the white seems to have gotten a bit bigger. I guess what I want to know weather or not this looks like it could be something else. And if he and his mate are gonna need further treatment. His is also getting his own qt in a few days to avoid any other battles until the dt is ready for fish again...