Instead of spending the cash for a 40g, just go to Home Depot and buy a Sterilite bin and a UTH with a t-stat.
Dumerils like it a little colder than most boas. They like it around 76-78F on the cool side and about 86-88F on the hot spot. And they generally love to burrow and hide.
Here's a picture of my little 3 month old baby girl out and about the night before dinner time lol.
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