When I kept my 120 I simply stacked. When I needed pieces to be held together, I'd do it with small bits of epoxy. I've never tried it, but it would seem to me to be a pain to rearrange rock in a 90+ gal tank if all the pieces were stuck together on pvc. Remember that you'll be adding rock from time to time when you get new corals, maybe drop frags in between rock, want to get in between a couple pieces to pull algae etc....so you may need to move rock around more than you expect.
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-Mason
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