91 for a basking spot is pretty hot for this species. They tend to thrive at ambient temps of 80-82 with no hot spot. When we provide basking spots, it's in the 86-88 degree range. The bloods and short-tails definitely show a marked preference for cooler temps.
Also, humidity might be easier to regulate in a tub rather than a glass tank, depending on your setup. Here is some additional info on setting up a captive environment for these snakes.
Good luck with your new STP! They're rather addictive.
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