Glass aquariums and tanks can be difficult to maintain humidity and temps in.
Take a look at the PVC enclosures. They're easier to maintain the proper environment in.
You can check out something like the T-8 or T-10 at Animal Plastics to get an idea of what I'm talking about.
http://www.apcages.com/home/
http://www.apcages.com/home/terrestrial/T8/T8.htm