$20 for all 3. Description Coral base rock will become naturally live overtime because of its porosity : No artificial or engineered bacteria, Rapidly adapts to the LIVE environment , Made from aragonite base rock, Will not cause pH spikes, Similar in composition to LIVE rock, Perfect for Coral farming, Free of Biofilm, Naturally clean, Helps to conserve Natural reefs, Will not affect the cycling of your tank. Safe for all corals, fish and invertebrates and Does not contain glue or cement. Features & details 100% natural aragonite rock is great for decorating aquariums, conserving natural reefs, coral farming, culturing rocks and growing live coral. Rapidly adapts to live environments and will not affect the cycling of your tank water so it’s easy to set up. Acts as a naturally porous biological filter and is free of biofilm so it’s perfect for aquascaping. Naturally porous surface helps grow denitrifying marine bacteria that help decrease nitrate levels. Works for saltwater and freshwater aquariums and has been pre-soaked to prevent leeching so you don’t need to soak it before using.