You can possibly try using cling wrap instead of the plexiglass for a tighter seal. I'd also switch to a RHP with a reliable thermostat and consider keeping about 75% of your screen covered. I personally used laboratory grade shredded aspen and the humidity in my tubs rarely drop below 60%

You can also add a larger water dish as well. My adults and sub adults get 4" wide, 16 oz deli cups that sit on PVC couplers, so they can't knock them over.


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