Well, I learned something today on this thread, and that was that these guys like more light. Mine only open at night, and even then not fully like the teal ones. I've moved mine up in the tank (pity too as space is limited) and they seem a bit more inflated. But this morning when I fed them, same thing only a few were wide open, a couple were half open and the others didn't even bother.

You may have to wait a few nights and see how they do in their new location.