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Originally Posted by kwirky
And I would buy my rocks, then build the structure during the curing process, having the rocks handy to make it all jive together.
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That's exactly what I plan to do. I've got 140lbs of Tonga coming this week from J&L and while it cooks I plan to pull it out and figure out how it will sit and drill it for PVC.
Some people use Thorite (by Thoroseal) cement to attach rocks together. The cement adds to the rock & becomes part of the rockwork itself. Then you don't need to drill or use acrylic/pvc or anything but the rocks & cement. It's reef-safe and can be found on many threads on RC.