I didn't have much luck with mine. Powder Blue's seem more susceptable to ICH than other Tangs. Mine was very healthy, and was doing well, but generated ICH and it couldn't fight it.
I have the following: Hippo, Yellow and a Sohal Tang... all are ove a year old... Personally I am glad I got the Sohal last, very beautiful fish, would take that over a Powder Blue any day... but be careful these can be very aggressive, so if you want to try this one, it needs to be added last... Mine has been great towards the other tangs... only aggressive to my Foxface, but that has been wheening off, he seems to be calming down as he grows up.
All tangs are beautiful though!!!