interesting thanks for replies.
I got mine 4" pbt yesterday from my LFS. it looked pretty good in the store with good color, not particularly thin, no signs of disease, although they said he was in tank with coppper b/c he had recently had ich.
Anyway i put him in my 6' tank with a female scribbled angel, a yellow-headed b-fly, and a bunch of smaller fish (fairy wrasses, gobies, halichoeres) who have been in there for ~ 1-3 years. This afternoon he is eating OSI spirulina flakes and frozen brine quite well.
He is quarreling with the b-fly, but neither is being too bad.
these are really spectacular fish.