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I covered mine with the 1/2" pink insulation board from Home Depot. It took a little while but as long as you have a good razor knife, cutting it is easy. They also sell 1" material but I did not need that thick. This keeps the tank around 78.3 degrees during a mid-twenties night in an unheated basement, close to the garage doors. This is about 3 degrees higher than without the cover. The sump sits on a metal desk, the skimmer and return pumps are external.
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