since you already have the tanks then i would use the 40 gallon, i use a 20 long now because my snake is smaller but what i did was i used the black foam board you find at walmart in the school supplies section to cover both sides and 3/4 of the top and bottom of the cage and i use an aquarium background for the back. this helps keep the tempsand humidity where it needs to be. just some suggestions if you have trouble.
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