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I’ve had good success glueing small rocks (baseball size). First I sand/grind one side completely smooth, then I put a good amount of superglue on the surface. Briefly submerged rock+ glue underwater( usually in buckets) after the glue skins over you’ll want to tap and mix the glue up with a toothpick. Add a small amount of more glue then attract to glass. Constant pressure and slight lateral movement helps glue hardens.How do you glue rock to glass.
I tried supergluing montipora to glass and that was a failure. But it glued to the acrylic weir