I have my live rock resting on some large diameter black pvc, the kind used for house plumbing drains. Cut a chunk out and a hole or two to allow burrowing critters the opportunity to move stuff around inside the 3/4 circle. The stuff floats though, as I found out and when I set up my next tank I'll take a little more time and perhaps silicone the pieces to the bottom.
Some of them have become exposed a little through the sand due to my Maroon Clown and Blue Devil Damsel rearranging the substrate, but I don't mind, eventually coralline grows on them and they blend in to the scene.
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