Fauna Marin The Sand – Bahama Nature 20lb is a premium natural substrate designed to support the biological balance and aesthetics of your marine aquarium. With a grain size of 0.4 – 0.8 mm, this sand offers a slightly coarser texture and a more natural structure, making it ideal for reef tanks aiming for an authentic ocean floor look. It provides excellent stability for aquascaping and prevents excessive sand shifting from strong currents or active livestock. The Bahama Nature variant not only supports beneficial bacteria colonization but also enhances the overall realism of your aquascape.