Here's a few tricks to help with humidity.
1) use a larger water dish. Wider surface area promotes greater evaporation. Move dish to the we're side of the enclosure
2) cover 90% of the screen top with taped down foil, plexiglass, or damp towel
3) use a substrate that retains humidity more. (Coco husk or cypress mulch)
4) if you're using a heat lamp, get rid of it. It sucks humidity up like a sponge.
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