Yeah, I've researched them for a while. Most of the information I have found about glass breaking seems to be more of a myth than anything. I know they can break glass but it seems to be very rare. I do want to put something under the sand. I was thinking either some egg crate or acrylic. It's gonna be a while before I get one. The deal with my Wife was I could get the tank but I have to finish setting up our big tank and put wood floors in our room. :P Can't wait to get one though!