I got some 1/2" acrylic rod at the acrylic store (about $5 for a 8ft rod if I remember right), drilled holes in my rock, attached some eggcrate to the bottom of the rod for floor support, and just slid my rocks down onto the rod. Works pretty well, and allowed me to stack my rocks high and in the center of the tank, giving fish more swimming room.
Here's a pic - you can see the rod sticking out of the one rock as I was sill placing a few more. Every rock is on a rod though.
I have mine stacked against the back of the tank. I leave the sides and front clear so I can clean the glass. The cleanup crew, snails, take care of keeping the back somewhat clean.
you can see how mine is stacked in the one video.
http://s998.photobucket.com/home/IPisces/allalbums
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