Well since light fixtures get really hot, you need to cut out the lid of a plastic tub and place screen mesh on top. The heat pad can go on the side of the tub additionally. People find that plastic tubs are a great for insulating heat and humidity. Also they are made from high-density polypropylene so the melting point isn't a concern unless you're placing an object directly on the plastic that gets up to 200 fahrenheit.
You should cover 3/4 of the top of your screen (glass or wet towel), leaving 1/4 of it exposed for a light fixture and airflow to help your issue with humidity and heat. What's the temperature inside your house? How much do you mist a day? Maybe try buying a digital thermometer/hygrometer since the calibration might be off with yours. Another troubleshooting method is to maybe build a cheap insulator box like a sterilite tub to set your tank into wrapped around a blanket. If all else fails, buy a $30 space heater at Walmart for the room your pacman is in.





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