Mike, I have done this. (Sorry I have no pics though) I made a tall pillar in my 90 gal using 3/4 inch pvc. Use a masonry bit to drill the rock and don't try to drill too large a hole at once; the rock will break apart. Start with maybe a 3/8 bit then go to the larger size. Wear old clothes and drill the rock outside because it is a very messy job. I made a frame of pvc for the base which is buried under your sand. Then cut the center pipe to the height you want. After you drill the rock just feed the pieces down the pipe and rotate them until they fit together well. Don't drill right through the top rock or you will see the pipe in it. Just drill 2/3s of the way through it and set it on top of the pipe. Your vertical pipe should be exactly the right length to do this. Have fun!
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