I have one I just got from my lfs as a gift for my patronage.
(Ha! Nobody wanted this last guy and they wanted to stock the tank he was occupying with bigger fish)
He's very odd, and only moves to reposition himself or get a breath of air. Sometimes I catch him climbing out of the water to rest on the floating driftwood but other than that he really doesn't do much.
Pretty dumb when it comes to feeding too, bloodworms floating right in front of his face and he doesn't eat them. He'd rather sift through the moss to find leftover fish flakes and bits of bloodworms from fish feedings, it's whatevers.