Thanks for the info, I rescued this guy from the LFS where he was wasting away in a 20 gal tank and thin as a rail. I knew my tank was a little undersized for a tang but better that than the grim reaper. I'Ve had him a year now and he's fat and sassy, a total turn-aroung from the skiddish starving fish I brought home. They really do get to be part of the family. Just wanted to make sure I got the drop on things before they go south. Thanks for the info I'll just be watching him a little closer for awhile.