Caribsea LifeRock ReefTree KitCaribSea LifeRock Reef Tree kit includes 4 LifeRock pieces as well as a support rod: one base, three arches. The kit is specifically designed to easily stack without any cement or glue. Simply slide the liferock pieces onto the support rod to create your custom Reef Tree structure. Reef Tree looks great in any aquarium and offers ample swimming space and room to mount corals. Life Rock begins as a sunlit piece of Pleistocene era seafloor thriving with