Hi reef tank, I got a new duncan coral and it's been in the tank for a couple of hours. The polyps became open for a while but then closed when the lights went out. Is this normal or should I be worried? Thanks :)

Hi everyone. I have a pulsing xenia I ordered online. It was shipped overnight to me. Looks to be pretty healthy and all. Good color. I've had it in my tank for 3 days now though and the polyps haven't opened up yet. Is this probably normal? Maybe just stress from shipping and being in a...