I've always brumated my atrox at 55 degrees.

Not sure what a "Northern Snapper" is though. In North America we have the Eastern Common Snapper, Florida Common Snapper, and the Alligator Snapper.

The Common Snappers require permits in Arizona to be possessed.
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Tim Cole
www.austinherpsociety.org
www.AustinReptileExpo.com/
www.AustinReptileService.net
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Conservation through Education