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I have used the putty - Its not "sticky" but you can mold it to fit into a crack or a hole. The set back for me is that it is white and it looks out of place for a couple of months.
putty or super glue. Make sure it has cynoacrylate as the main ingredient. Locite is my favorite brand. And, many corals can stay out of water for a few minutes without harm. Just get them to shrink up, a little irritated, before you pull them out. Wash your hands after handling any thing though, and don't rub your eyes/mouth/ears/nose/anything.