What are the temperatures in the room? I'm assuming he's in an aquarium, they aren't very good at holding in heat. You could put insulation boards around the tank (making sure they aren't a fire hazard), that might help keep it warmer if you're okay with it not looking very good. No part of the tank should be higher than 90*F, an ideal temperature is about 87*. You could start by increasing the thermostat temperatures by a couple degrees, I wouldn't raise it much higher just to avoid an accident.
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