I'm keeping a close eye on them. They all should be well feed. This damage also happend over night I rarely turn off all my light but that night I did and when I cam in the next morning the iridescent sharks was how he is in the pics. In the end its my fault for putting him in the wrong tank set up. On another note It's still swimming normal and eating. Is it possible for it to pull through? Or am I just making it suffer?