You can put a heat mat in a larger enclosure on the side of the tank and block off some of the ventilation, then place the smaller enclosure you have your T in inside that. You can run a heat mat on the back of where your T's tank is and adjust the distance of the tank to the mat if absolutely necessary. BUT you have to be super careful to monitor your temps and not to burn your T. As long as your room is in the high 60's or above you don't need any additional heat.
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