Hard to say with that stand there. Tank is most likely recessed with the bottom portion that we can't see.
On another note, during my recent trip to SoCal, I did see one that was in a shallow tank with some other fish. It was actually kept in a softy tank with a filefish (that was trained to eat pellets and flakes) and a small black ear wrasse (H poeyi). Sandbed was only ~3" and the fish was in there for about 3 months. 3 of them went into the tank and only 1 acclimated to tank. It was eating flakes floating past it.