When I first got them, put them on the sand in direct light, they did it. Then moved them to indirect light, they did it again. Then I scrounged 3 of the heads from my sump, superglued them to a frag mount. This time, I stuck them in the shade. They did it again ??? It's like they open up and look great everyday. But just start extending and then the tube looks like it's pinching itself till the head is seperated. I've basically had them in lower flow areas ???