LifeRock Shapes are the most fantastic LifeRocks yet! A beautiful assortment of tunnels, arches, and holey pieces to make any tank spectacular. Use as accents or 100% for the wildest tank ever! LifeRock™ begins as a sunlit piece of Pleistocene era seafloor thriving with living creatures. Over the next 100 millennia and the retreat of the ocean, this ancient piece of seafloor, now well inland, has formed a pure, aragonite-bearing rock. This clean base rock is 97% calcium carbonate with minor and trace elements such as strontium, magnesium, and barium. This base has an amazing 50% void space which will provide residence for billions of water-purifying bacteria. LifeRock™ is infused with bacteria using AragAlive™ technology which results in a reduction of traditional cycling times. Each piece of LifeRock™ has multiple engineered aragonite coatings that not only maintain the extensive macro-and micro- porosity but yield the soft muted colors of a living reef. LifeRock™ is a superior rock of true marine origin without hitchhikers, organics, or algae. No curing is required. With LifeRock™ you will get the look of an established reef from Day 1. Now go Build Your Ocean™!