Might be ... I have some GSP in my Nano and I notce that when the hermits make their way onto the rock the polyps tend to close, but then they come right back out and kind of cover the hermits!
Give it some time though if you only got them yesterday they need time to adjust, I think it took mine about a week to fully open! What kind of lights are you running?
God grant me the serenity to accept the thing's I can not change, the courage to change the thing's I can and the wisdom to know the difference!
R.I.P Walena K. Cox
7/7/62 - 8/11/2002