Okay, so you are having heat issues. Let me just go over the top for you and suggest insulation for the tank. There are a lot of other options but here are my own suggestions.
Triple layer aluminum foil wrapped around 3 sides of the tank, and over the screen lid. This should increase the heat somewhat.
Rigid foam board insulation surrounding 3 sides of the tank, with aluminum foil on the screen lid.
Either option will increase the internal temperature by helping to maintain the heat in the tank.
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