Safe epoxy or glue?

[tang daddy]

to hold large rocks together I would use acrylic rods.

to glue frags use super glue gel of any make as long as it's gel, I like using the loctite brand.

also the active ingriedient in the gel is called cyanoacrylate dunno if I spelt it correct but as long as it has this as the main ingriedient it's reef safe.