Live rocks in your marine aquarium contribute greatly to your success of your aquarium, and the porous found within the rocks which is extremely porous and serve as the primary biological filter in saltwater tanks that is required to have a healthy aquarium. The many holes and crannies in this rock give it a tremendous amount of surface area for both the beneficial aerobic (needs oxygen) and anaerobic (does not need oxygen) bacteria to live on. This is what makes live rock such a great biolo