Help!! What is happening to my Naso Tang?
 

Purchased this 2 1/2" Naso Tang 3 weeks ago. First week, he had small white specks (perhaps ick or what-not) but all alse seemed fine. Last few days, however, he has developed the darkish scuff mark on the underside below mouth and gills and is even a little larger today!? He is eating very well and not at all behaving like he is ill, but wondering what the heck this is and is it something I can cure.

Any advice is appreciated.

I had the same thing happen to a Nasso that I have a while back, I think it was from scraping on the rock, most likely bullying from my Powder Blue. The Nasso had several of these marks, I eventually transferred him to my sump, the marks disappeared within a few days and he was given a new home. Do you have any other fish that may be bullying him?

One of a few marks that showed up on my Nasso (just behind the eye)
http://i36.photobucket.com/albums/e1...2/DSC_8782.jpg
HTH