Agree on the cooler temps. They are South East US, not primarily tropical.
Mine is full grown and active. He uses every inch of his 36X18 enclosure, and climbs too. I like the 40 gallon Zilla enclosures with the slide out top for utility and economy, and they have the same foot print as the large-tall Exo-Terra (which houses the corn). You may eventually find twenty gallons is a bit tight for an active full grown corn, but I'm just guessing going on my own experience.
Enjoy!
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