OK. So I rescued this vlamingi tang from the local fish store about a year ago. At that time he had some open places on his head. In the year I have had him I have treated him 3 times with Metroplex but it hasn't done anything. The fish has always been happy and acts healthy ever since I have had him. Super active and eats like a pig. Has grown probably a couple inches and even gotten streamers on his tail since I have had him. I kept thinking it would go away on its own but it hasn't. It almost looks like the skin around his head has pulled apart in places. I've never seen anything like it. Just wanted to get some opinions on this as he has now become my kids favorite fish and I would hate for it to be a problem down the road that I could have addressed now. Thanks.