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I would not suggest gluing your corals directly to the rock...if you want different corals or want to move them it will be a pain...i would suggest using putty and attaching a 2-4inch carbon rod (there are many types of carbon rods you can buy that is used in rock structure in saltwater tanks) to the base of the coral (you don't need to use much putty just about the size of a quarter...it will harden like cement, but easy to remove if you need too)...you drill holes in your rock where you would like to place your corals (just make sure the drill bit is only slightly larger than the carbon rod, because you MUST have a snug fit)...this way your corals will fit into your rock like a puzzle piece...this allows the freedom to move your corals around or remove corals...they will be completely secure as long as the holes are a snug fit...
Funny how things work. Been checking this site for a couple of months and was about to ask about what kind of glue to use. Friday, I stopped at the LFS and asked him. He recommended Super Glue Gel so I tried it yesterday. Now today, presto, here you guys are discussing it. LOL.