Securing corals with epoxy or other methods

[muck]

I would try AquaStik Epoxy Putty.
I have never used the product though so hopefully someone can jump in and comment on how well it works.

AquaStik™ Stone Grey. Underwater Epoxy Putty for marine and freshwater aquariums, Ponds and Paludariums. Also useful in Reptile & Small Animal habitats. Neutral color. Non-toxic to fish, plants & small animals. Cures dry, damp, or underwater. 4 oz. (114 g).

AquaStik™ Red Coralline. Underwater Epoxy Putty for marine aquariums and reef aquariums. Color matches coralline algae and live rock. Excellent for securing rock, stony corals, gorgonians and aquatic plants. Non-toxic to fish, plants & small animals. Cures dry, damp, or underwater. 2 oz. (57 g).