No humidity issues at all!
Now that pic is a bit deceptive, it was probably taken during the rainy season this year. But if you look back at quadrant #1 you will see one of the four cardboard/foil panels installed. Also that big plastic box is covering up most of quadrant #3.
Even now with dry air I have no issues because I have a great substrate system for THIS tank. It is a layered system of clay balls on the bottom covered with a solid inch or more of Eco Earth coconut husk that so many folks dislike.
Every two weeks I pour anywhere from 1.5 - 3 quarts of water directly on the top. It soaks the coco well and drains to the clay balls to be slowly released back into the Coco. This system has worked very successful for a few years now. The snake keeps the earth packed down so it is not sticky or messy as others claim.
Here is a pic today with 90% coverage.
Here's a shot taken the other day with high humidity on the cool side of 72.
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