I have the almost Identical setup but with a 10 gallon tank and a ceramic heat emitter in the middle and foil covering 98% of the screen, with no moss inside. The che will do the same thing, dry it out quick. I figured that out 2 weeks ago. The minute I turned it off the humidity rises from 50 to 65%. Every couple days I would have to spray the substrate good and damp to keep it above 60%.
So I have added a second water bowl and keep the che off until I can get a radiant heat panel setup figured out with this tank. It's been 3 days with the che off, the cool side stays at 75*f, hot side 95*f, and humidity hovers around 80%. I have extra thg heat tape I was thinking of putting on top of the screen hot side to warm the air temp and not mess with the humidity.
Here is my thread to give a better understanding of what I've been through.
https://ball-pythons.net/forums/showthread.php?t=246577
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