zoas head dropping

[liquidnoise]

Realise my zoas head keep dropping of the colony....the strange thing is tat some of the bigger heads actuallu swee swee parked themshelves onto the rocks. but most will drop on the sand bed. some seems to be opening up on the sand bed even. I tried to stick them on the rocks but its a very messy affair as they are so small and sometimes i ended up glueing the whole thing.

Any1 have such experience? wat you you guys normally do? just leave them alone?

[kfd]

check your ph and kh