zoos not opening

[Reef-r-madness5150]

I have a fairly new clump of zoos in my nano and lately they haven't been all opening. SOme do but alot of them don't. They were fine not long ago, all open after the light was on for a while. Now everytime i look in there, most polyps are closed. Tested the water and al the levels are ok. Any ideas? I know anything touching them caues them to close but nothing has been bothering them