Your advice please!

I would get another uth and place it under the cool side because you need to make it 10 degrees warmer and that will do it! Put it on a dimmer and adjust it to give you 80 or so unless you can afford another thermostat!

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Originally Posted by Kaorte

Try insulating the back and sides of the tank with dark foam core board. If you haven't already that is.

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I use polystyrene insulation, available at home improvement stores. Basically it is fancy strofoam, but effective...