yes. i have 2 cleaner shrimp. and they actually closed up a few days after i got the shrimp. but i never see the shrimp up there. they stay down below in the LR
I have a rock full of small green zoo's and they have been closed for the last few days. everything else in the tank is fine. I was wondering if they are dying or what. They are way up top in lots of light but not too much flow.