When i kept my ball pythons in tanks i used "versa tops" on all them. It's a glass top that folds and comes with a plastic attachment that clips and slides onto the glass. You have to make ventilation holes in the plastic part. It's a great tool and will not only fix humidity issues but it will contribute to overall ambient temperatures. They are sold at Petland , Petco, and Petsmart. Whatever the gallon capacity of your tank you ask for the corresponding sized "versa top".
Stay in peace and not pieces.
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