Nate, I'd give it some time. If I do a little aquascaping and move the rocks some of my zoos are on - they wont all open for a little more than a week - sometimes two. Give it time - if you've got more than 80w of lighting they should eventually come out of hiding.
However, if they've been in there a month and they're still closed - I'm surprised they've not perished and withered away.
How long have the zoos been in the tank?