The humidity in my tank is only at around 20% and I know it needs to be at around 50% - 60%. her stomach scales are very dry. How do I increase the humidity in her tank? I have her in a glass tank with a screen top. I recently changed out the red sand that her tank had come with, with aspen bedding, could that be the problem? is there anyway to change this that isn't that expensive? At least till I save up enough money to fix it permanently?