My resturaunt had a couple of those in one night for the sushi menu. They set it down in front of us at our pre-shift meeting and I just froze up. I got yelled at because I couldnt take my focus off it. Wierd animals.
They sell those at the asian markets all the time... funny how one picture 1 is "erect" as far as aquarium compatability.. i say you can but you need a mud bed and some mild flow