My tomini tang isn't doing good and I didn't know why but until I saw black spots on him. They are more brown-ish then black and its on his fins. He is in qt right now because my fish had ich so I could be the medicine which is ich x by Hikari or something like that. My coral beauty who is in the tank with him picks on him sometimes but I'm not too sure it that, could be tho. If you need a picture I can try to get one.