We only sell premium all natural rock which can make them easy to stack when creating a base for growing live coral or as an addition to existing coral-based ecosystems. Because it is dry and therefore not technically alive anymore you can add it to your existing aquarium without damaging your existing marine ecological system. The porous characteristics of this rock provide a natural biological filter as well as a perfect environment for denitrifying marine bacteria to grow and flourish, which effectively reduces nitrates in your tank.
Please take note that your rock order may be different size and shape than in the pictures shown.
Awesome Shapes Easy to stack!