My green PE's were doing fine in one spot for about 7 months, probably 60+ polyps, moved them two inches to the right to make room for more frags, and they closed up, started to bleach and looked funny, moved them within a week, I figured that I have moved them from the middle (Least amount of light in my tank) to closer to direct light from my LED's, So just my experience but they apear to not like direct LED lighting (strong cree 3w LED's) they're doing fine though now.
Dsdaley, im not sure why they do they, I Just got in a frag of about 10 polys called "Pucker Up Pinks" And they all looked like that at first, hence the "pucker up" name, but now after about 3 weeks in my tank they've flattened out, all but 2 or 3. So Im goin to tag along with you and figure out what was goin on with these, theyre right in the middle lke my PE's and receive a good amount of flow, maybe more flow helps open them up?