Nature's Ocean 12-Inch Coral Base Rocks for Aquarium, 40-Pound Aquarium Decorations used for Conserving Natural Reefs Perfect for Coral Farming, Culturing Live Rocks & Growing Live Coral Rapidly adapts to live environment & Will not affect the cycling of your tank Naturally porous Biological Filter, Free of Biofilm & Perfect for aquascaping Soaked in deep water well to prevent leeching