Thanks for the input. I'm not sure even pots will work but it's worth a try. When I first got him, he went into NPT #1, 10 gallon, and was well behaved until he grew an inch or so. When he first started digging, I put in some sandstone chunks averaging 2 x 2 x 1" thick around some of the more important plants and he's actually tunneled underneath them. Right now only a well-rooted Wisteria and a few Ludwigia Repens are holding on. There are a couple Crypt leaves poking out from some of his slash piles, but the crowns have disappeared. It's really pretty comical and I suspect aquascaping is his hobby, too!
Thanks again,
Jim