if you do that, at least put some acrylic or hdpe under the sand as they are strong enough to break glass with their clubs when they get bigger, and the likely glass they would break would be the bottom while burrowing. don-in-sa used to have a big one in a 58 gallon tank for a long time, and we had a 4" one for a while in a little acrylic tank. they are really cool, interactive critters. if you do a search, you may come across some of donny's old pics