I have only used it to directly attach a coral to a plug or a small rock piece out of the water. I think you need to use epoxy attach the plug to a rock already inside the tank as you found out it cures super fast under water. If the rock can be removed from the tank for a minute you could attach it that way with CA glue. By the way, if buy a little spray bottle of kicker (accelerant) it will instantly cure your glue out of the water as well so the coral spends as little time out of the water as possible.
|