The aspen seemed to dry out very quickly and felt like hay so I switched to reptibark. The foil/tape trick..... I found it here, will have to look for the link to the thread for it but essentially it a couple layers of aluminum foil with foil tape layered over it and formed to the screen top which helps hold humidity in the tank. The only part uncovered on mine now is the hole for the light, which unfortunately, I need for temp control and the door access. Some also add plexiglass which helps further, I don't intend for this to be her final home so didn't go that far.