+1
Bro Nic, the probable reason why zoas didnt open up in your case could be due to 1. shock from the drop, 2. stress from the glue, 3. from the new light intensity
Try see if the zoas still preserve it's shape and not shrinking in size. Try to place the zoas back to it's initial place as suggested by Bro Reefish. If there is no visible shrinking in size, most likely it will open up eventually. If you observe that the zoas starts to shrink in size, it's probable dying from the injury due to the glue.
Gluing zoas onto frag plug has a slight technique to observe so that the zoas skin are not being burnt by the chemical of the glue. Feel free to come by someday i will share with you how to do it.