I have one, just make sure all your rockwork starts from the bottom of the tank.
I placed my rock in first on the bottom glass, and then put sand in.
They burrow under causing rock work to shift. so be prepared.
i have it paired with a goby, but i cannot put any frags on the sand, as he WILL move them.
also they move sand, A LOT so if you like nice even sand dont get them.
mine likes to bury what every they can and try to bury even the low corals.
Im kinda over him, but theres no way I can get him out now.
sad but true
-Joe