Hey Kip,
As Mark has said, it's normal for many colors to loose coloration after being introduced into a different tank. All of my A. secale, A. nana, etc. have lost their purple tips after being in my tank for 2 weeks. From my experience, the coloration will come back after the coral grows out.
the polyps only come out under VHO... when the halides come on.. it closes up.
Do the polyps completely close up, or do they just slightly retract into the coralites?
Graham