Thanks for the comments. I'm sorry, I did mean driveway markers. Acropora Nut used 1/2 inch pvc for his. I was going to use PVC for mine but my pieces of rock were too small and would shatter if drilled.
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180 Gal Reefready, 75 gal Sump/Fuge, Reeflo 200 skimmer, 3 250 Reeflux Bulbs in Lumen Bright reflectors powered by coralvue electronic ballasts, PM Kalk reactor, 2 Vortechs, Geo 618 calcium reactor
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