I used 2 pieces of 1/2 inch acrylic sheets on the bottom of my tank. I then used a drill press to drill holes were 1/2 inch acrylic rod was stuck into and glued. Some of these rods fit into holes in the LR that was drilled with a masonary bit. Seemed to go through my rock quite well. The other rods are just used to support other sections of the LR from underneeth. The whole thing worked well for me.
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