By dimmer do you mean a thermostat? or just a dimmer type switch? You can use a bedding to help raise humidity like cyprus. The aspen bedding is more like to mold pretty fast and doesnt hold up to frequent sprayings like the cyprus does. Most people just use a thick layer of paper towles and mist it down every day. The filled water bowl should help humidity. Covering the lid most of the way will also help. Get some little feet or those plastic chair risers under the tank to hold it up off the table and off the UTH cord. If its actually too hot this will help some heat escape and will save your table from cracking because of the high heat.
Having humidity too low is a big cause of RI in ball pythons so its very important.
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