Pulling rock would be easiest while you don't have corals growing on it yet. Hard to super glue under water. Use "super glue gel" make sure it's just cyanoacrylate super glue. And that will be safe. I use "gorilla glue" brand super glue gel. Make sure it says "super glue gel" not regular gorilla glue or any other kind of glue.I am seeing the super glue method around a lot, how would one do this? Do I pull the rocks out and glue them shut and then put it back? Or do you glue it right in the tank? Is superglue non toxic to the water?
Thanks for the help!