Nice! I figured that tank's an eye candy

Beautiful!
http://www.planetcatfish.com/common/species.php?species_id=134 Stinging catfish reaches close to 2' in total length maximum, so I agree, most of them may not grow much past 1'.
AFAIK, the entire family of Clariidae is banned federally. I vaguely recall them offered for sale if my memory serves I think in California, which, I remember, surprised me.
Yes, they are banned because people keep them ignorantly and irresponsibly.
You'd be surprised at their ability to survive. They are champions in this field. They are able to find a patch of warmer water and survive the winter, even hibernate, which in fish means aestivate - rotting vegetation, warm pipe, electric power station cooling water dump, warm spring, warmer sewer water, very deep water, etc.
Common pleco - another "armageddon" fish - have been found to overwinter in Poland in 7 degree Celsius water near power station water dump.