I have a 90 gallon reef, and I have always loved copperband butterflies. After researching, I am willing to take the reef safe risk of the copperband, especially given the benefit of the fact that it would clear up my aptasia issue. However, I have a yellow tang. From what I have read, people seem to think the tang would attack the copperband at first but eventually lay off. Any experience keeping to the two or thoughts?