au01st;277366 wrote: I use aquamend. Take superglue gel (with cyanoacrylate) and a little ball of aquamend. Put a bit of glue on 2 opposite sides of the ball. Put the coral on one side of the glue, and the other side faces down on the rock. Push down the whole thing. The glue will bond to the aquamend and rock, the aquamend will fill in any crevices, and the other glue will bond to the coral.
I used this method to glue on that frag of candy cane in my tank and I swear I could pick up the 10lb rock it's glued to if I had to.