What I do is use a combination of superglue gel and epoxy. Outside of the water, I make my ball of epoxy, then place a gob of superglue gel on it and stick the coral to it. I then place another gob of gel on the underside of the epoxy ball and press it into the rock (in the water) where I want the coral to go. The superglue holds the coral in place on the epoxy, and keeps the epoxy held to the rock until the epoxy hardens. You have to be generous with the superglue you're using on the rock/epoxy step because it skins over as soon as you put it into the water, so you want a good gob so there's still unhardened gel when you press it into the rock.
I've used this method with great sucess. Some of my more sensitive corals close up for a day after doing this in my tank, but if I run some carbon, they're always happy again within 24 hours.
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