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.
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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).
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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).
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