My naso tang has not ate for 2 days, now white spots, ich? I 'm taking to my lfs store, because I have no quarantine tank, he is going to giving it copper. They say that most tanks have ich, that fish develope a tolerance ti it, but tangs suseptable/ waht are white spots on tank? they said not ich, ich doesn't attach itself to glass. I do have white spots all of the back of my tank too.I noticed.