Try this: take a drinking class and put like a 1/4 cup of water in it. Cut a paper towel into strips and hang loosely out of the glass, and make sure they are touching the water. The water should seep up the strips and give you more humidity. I used this when I had my bp in a 50 gal aquarium.
You can look in the forums too for DIY humidifiers. Usually you can just cover the top half way with alluminum foil, but I don't know how that works with a side opened enclosure. You can also take some moist moss and fit in around his tank, and in his hides.
I've a damp washcloth on my hides before if i was having a bad shed. Be careful with wet stuff though, and keep an eye out for mold. Change them oftem.
Good luck!
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