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Superglue works well for small rock rubble and frags. Epoxy putty for bugger rock.
You can also drill holes in rock (with a concrete bit) and insert acrylic rods to help give you something to lock the rock together.
It's as much an art as a science. Knowing the techniques helps but ultimately you just have to get creative and/or accept the limited ways your given rocks will stack.
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Inconveniencing marine life since 1992
"It is my personal belief that reef aquaria should be thriving communities of biodiversity, representative of their wild counterparts, and not merely collections of pretty specimens growing on tidy clean rock shelves covered in purple coralline algae." (Eric Borneman)
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