Hoping to get some help from the guru. I was very careful to QT all fish in my new system and all was well until recently. Never saw any signs of disease in QT but they all still got the full treatments prior to being added. The final group of fish were added which were a hybrid tang, whitetail Bristletooth tang and a purple tang. Within 3 days of going into the display it was evident that somehow ich got in the display. The hybrid was the first to show signs but it soon spread. I hesitated to do anything since everyone seemed to be dealing with it but it continued to get worse. So I have pulled the fish and in an effort to get some relief quick I dosed cupramine. I have a copper test kit and it shows I am above the recommended dose but still in the safe range but I'm not seeing any results. The fish are still covered but still eating well. So what should I do?