the humidity is the most important aspect of a good shed. I had some problems keeping it up in my tank, the solution that works for me is to take a beach towel or a sweatshirt (something thick) and get it wet and put that over most of the top of the cage, just leave some open space for circulation. Ever since I have been doing that sheds have been perfect. This is why I'm switching to tubs, tanks are a pain to get correct humidy/temps. good luck