Rock Building.

For sure..
wont hurt the glass..plus saves you money in substrata...and all the burrow issues...I also think it helps control the ol' brisstle worm....again JMO

LG

 

The PVC pipe approach works well. Another easy way to provide excellent protection for the bottom of your tank is to cut a sheet of acrylic or PVC Gray Polyvinyl Chloride (PVC) Type 1 Sheeting - US Plastic Corporation to the size of the floor of your tank and lay it in before your rock and sand.

 

I wish I had put hte rock in first with my tank. However, I had got another 50lbs of live rock and ended up removing about half of my sand in the tank, moving the rest to one side while I placed the rocks on the bare side, then did the same on the other side. It was a pain and I definitely recommend rock first, then sand.

Another approach I had heard that I would like to take is using the plastic shish-ka-bob rods and drilling a little on the rocks and connecting them that way. I figure that I can re-aquascape later on if i want to change things around.