A special adhesive formula designed by Korallen-Zucht. Speed Glue will stick with a high-speed binding mortar that solidifies like cement. Mix to form a thick packing mud consistency and watch it harden to stone! Works great on your corals, live rock aquascaping and even overhangs without problems. Longlasting and rock-solid adhesive. Sticks in and outside of the water. Does not harm even sensitive corals. Also well suited for frags. 500 grams