Coralfix is our 2 part epoxy
Coralflex is as Uhuru said, it is a "new" type of adhesive that sets up very quickly and is completely non toxic, it doesn't cause any irritation to the user or corals. It does have two parts that must be kneeded together, it sets in under 2 minutes. It remains flexible so soft corals and gorgonians can still sway in the current. Basically, it is faster, easier and non toxic, main draw back is it costs twice as much and coralline doesn't seem to like to grow on it.