I have a yellow tang that has a dark spot on it's side this started after the ick is in qt,I'm using coppersafe ick has cleared up for now waiting to see if reappers this is 2 1/5 weeks into treatment , I was wonding if it could have rubbed to hard on something and did this since it started after I seen it rub really hard on a fake rock I had in the qt and what should I do for it would take pics no cam :1zhelp: thanks