Arag-Alive - You can now bring the world"s most exotic reefs into your home with CaribSea"s Arag-Alive substrates, It is developed from CaribSea"s cooperation with public aquariums and zoological parks, where authenticity is a must, Arag-Alive helps maintain a proper pH for the life of your aquarium without the constant addition of chemicals, and creates a biological balance to discourage nuisance algae, Arag-Alive contains millions of bacteria per pound specially engineered for aggressive waste reduction in closed systems like your aquarium, Arag-Alive is engineered to suppress ""new tank syndrome"" and compress the ammonia cycle, It begins to cycle your aquarium instantly, In fact, independent labs prove Arag-Alive cycles your aquarium days faster than other brands, SKU: RYLHC1155