I'd suggest that there is way to little ventilation. There are documented connections between high humidity and low ventilation and respiratory problems. Humidly should come from the size shape and placement of the water bowl not from the snake's breath. With out proper air flow you are building a petri dish.
I use double rows of 1/4 inch holes 1 inch apart and 1 inch from the top on the ends and a few on the sides.
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