Hello, my Yellow Tang which has been in QT for the last 3 weeks has suddenly started getting red lines on its forehead and the side of its body. Its also decided to stop eating since since yesterday (Thought nothing off it untill tonight). As for breathing its also gotten a bit erratic. Only Chemicals that have been added to the Tank are Copper, which are followd by routine water changes. Is this some form of Bacterial Infection or Normal for Tangs?