The Aqua Medic Reef Holder is a system for fixing decorative material to the aquarium glass. Rock formations can be hung easily off the side or back of the aquarium. When using live rock, a natural looking cave can be constructed. With the aid of a template - supplied, holes can be drilled into the rocks. Plugs are pressed into the holes and attached with Reef Construct, our special epoxy adhesive for reef aquaria.