Seachem CoralCrete™ is two-part epoxy putty that can be used to secure coral to rockwork or to fuse together rockwork for more stable foundations in reef aquaria. It has a working time of 5 minutes which allows for plenty of work time while also quickly securing coral or rock. CoralCrete™ is ideal for working with larger colonies of branching coral, most large polyp coral or adhering plating coral to rockwork. CoralCrete™ is safe for aquarium inhabitants when used as directed.