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You could go all the way and drill the rock for stability and use fiberglass rod. I've used that technique for many of a tank build. Even with live rock/wet.
1/4" masonry bit and some fiberglass driveway markers from one of the big box hardware stores. Why fiberglass driveway markers? They're cheap!
Stack your rock work the way you want it, take some of the rock out in drill a hole into the rocks like puzzle pieces. Cut the fiberglass rod to its proper length to assemble the two rocks together. Repeat.
This keeps all the rocks from collapsing or falling.
1/4" masonry bit and some fiberglass driveway markers from one of the big box hardware stores. Why fiberglass driveway markers? They're cheap!
Stack your rock work the way you want it, take some of the rock out in drill a hole into the rocks like puzzle pieces. Cut the fiberglass rod to its proper length to assemble the two rocks together. Repeat.
This keeps all the rocks from collapsing or falling.
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