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Live sand refers to a type of substrate commonly used in saltwater aquariums. It consists of sand that is populated with beneficial microorganisms, such as bacteria, algae, and small invertebrates. These organisms help to break down organic waste and maintain water quality in the aquarium. Live sand also provides a natural look to the tank and can support the growth of corals and other marine life. It is typically made from aragonite, a type of calcium carbonate that helps to buffer pH levels and maintain stable water chemistry in the aquarium. Live sand is often recommended for establishing a healthy and balanced ecosystem in saltwater aquariums.