I appreciate the advice to hurry but hurrying (in general)has gotten us into all the trouble we are having. I don't want to lose the tang, but if we'd followed the initial advice we were given to treat with copper, I think we'd have even MORE problems especially because she wants the tank to be reef and fish together... My wife has found a marine aquarium guru that lives close by and she is going to meet with him tomorrow. (I hope she doesn't run off with the guy!). Thanks again for the advice and I will be sure to post back what we end up doing and how it works out.. For now, the tang has a good appetite, isn't scratching or flashing and is behaving normally. It's possible we mis-diagnosed the condition in the first place but I don't think so.