Running out of space on your rock work or frag rack for new corals? Try using magnet mounts or simply glue a frag to the glass. Many corals, especially Zoanthids, grow very well on the glass of an aquarium. Provided enough time, they can even cover large areas, effectively hiding cords or other items dangling down the back of your tank. If you want to glue a frag to the glass, you must lower the water level in the tank and dry off the area where you want the corals to attach. Use a gel-based glue, since it won’t run as much. Attach the frag and you’re good to go.