Do you have a picture of your setup? What is the top made out of? If the holes are only for humidity, tape them up. You don't need them and the che should dry up the cage fairly quickly. People tend to add vent holes in cages and it allows for too much heat to escape and they are usually unnecessary. Post a pic it'll be easier to diagnose. I have multiple custom cages 4x2x2 and heat all of them with a 100 watt che's. So it should give you enough
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