The foil is actually foil tape, holding on the blue insulation board I place over my background, back and both sides, on all tanks to keep heat and humidity stable. That's why I said the 10gal was showing the tank insulation as well as the screen treatment. You can also see the same stuff taped to the sides of the two 20's. The foam board itself is visible under the 10g tank.
It works wonderfully, and even living in Denver, CO I never had my temps fluctuate more than 2 degrees.
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