I find the peg idea to be really intriguing. My only concern might be that once you put the substrate in (your plan if I read your build right) the sand will fill in the peg holes. Subsequently, I would think that this fill-in would make it really difficult to move the aquascaped pegs after-the-fact (as the sand would presumably fill in the holes). Have you given any thought to this?
Other than that little problem, I think this is a wicked idea for aquariums. It keeps the rock stable and protects the bottom from scratches. So long as algae and things cant slip underneath I could see people implementing this into their builds.
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