Originally Posted by mr_X
What kind of coral are you talking about? Some you can use Crazy Glue Gel on, but others you can't.
Soft corals, like leathers & mushrooms, will not glue.... they tend to produce a protective slime which prevents the glue from sticking. "Softies" usually either need to be tied to a rock until they take hold on their own, or placed in a small tupperware bowl with some rubble rock for them to attach to, and cover it with mesh to prevent them from blowing out of the bowl. Once they attach to a small piece of rubble, that can then be glued where you want it to go.
For corals like branching LPS
, you can use either cyanoacrylate gel (gel super glue) or an aquarium safe 2-part epoxy..... I use both.