My colony often closes for the better part of a day after H20 change. Funny thing is, individual polyps of GSP that have settled elsewhere don't?! Anyway, they'll be back.
Mine closed up in my tank at home. I brought them into work and dropped in my nano. It took about 3 weeks for them to fully open. And I'm still waiting (it has been about 2 months) for them to turn green again. They are pink right now.
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