HCA: Hermit Crab Association

Haha I wish I had an answer for you! I have no idea how the humidity is so high in my tank. It's just sand with coconut fiber. I'm not doing anything terribly special.

Help please! It's difficult to regulate the humidity in my crabitat. I feel like there is no sweet spot. I can keep the glass lid tightly shut, then the substrate will stay nice and moldable. Then the humidity skyrockets and stays at 99%. I could prop the lid to let out some humidity, but the result...