AF Gel Fix is designed for precise gluing of small coral cuttings. Due to the density of AF Gel Fix, it makes sticking coral frags to rock or plugs easy and effortless. The gel does not contain toxins that are dangerous to sea life. The glue can be used in or outside the tank. Bonds in 10 seconds. How to use: Apply small amount of AF Gel Fix to the surface to which you want to stick the frag and immediately stick it to the designated place. Let it dry for 3 minutes. After indicated time you can place the coral frag in the tank.