blue hippo tang question

[luvsaltshops]

I have had a blue tang for about 2 months now. His face has been slowly getting marks on it. I'm not sure if it is from the rock he hides under or if it a tang disease. I am fairly new at saltwater tanks, so i'd appreciate any advice on this tang problem.
Thanks, Jo

 

[beth]

There was a thread started by sask a few days ago which is title, "What is wrong with my powder blue". Look back at the threads for a few days and see if you can find it and go thru the posts, as well as the links I provided. I beleive this may be the problem you are experiencing.