Ive seen and heard of this happening as well... doesnt happen all the time or with all polyps but I think its a fairly normal thing for the ones that do. As long as they open back up and the new polyps open I dont imagine itd be something to be concerned with Bill.
I too- have seen this happen, right before a bunch of baby polyps appear. Like chort mentioned- somtimes, and not on all the polyps I have owned.
I think Mucho is on the right track- maybe the energy exertion of popping new polyps causes them to close, or closing and building up energy to make new polyps?[COLOR="Silver"]
Anyother possible consideration would be that they are stressed with the new growth of the mat/polyps and obviously we know many of our corals close up when stressed
Just a thought.... although not likely since if this was the case more then likely all zoas would do this when new growth is goin on
I had 1/2 of a colony of Bam Bams close up for close to a week. I didn't see any bugs on them and everything else in the tank looked great!. I even dipped them in case something was irritating them. After several days, they finally opened up back to normal and there were a few baby polyps.
zoas closing when growing 
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