If my insurance company got wind that I was moving an aquarium that had unsecured rocks in it, they'd jam it up my ass about 1/2 a metre, break it off and leave the balls hanging, then they'd cancel me. If, and that's a big IF, you want to move a tank with sand/water in it you need to support the tank on the top part of the stand directly under the tank, lift evenly, place on a dolly and move. Pulling a tank across the floor on its base with stuff in it is a recipe for disaster.