A couple things you could do. You could raise your room temperature for a while until you figure out a better way. I have 40 gallon breeder for my male and on the cool side I keep a 75 watt infrared bulb and that keeps my temps at about 81...I also keep my room at about 75 though. You could also get a ceramic heat emitter, I don't use one but I hear they're good as long as you have a thermostat to hook it up to...Or you could get another under the tank heater for the cold side thats smaller then the one on the hot side.
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