Fauna Marin The Sand – Bahama White 20lb is a high-quality natural substrate crafted to support a healthy and visually stunning marine aquarium. Featuring a grain size of 0.1 – 0.3 mm, this ultra-fine sand is perfect for sand-sifting species and bottom dwellers, while also offering a smooth, clean base for coral placement. Its brilliant white colorenhances light reflection, giving your tank a brighter and more elegant appearance. Designed to promote natural biological filtration, this 20-pound bag provides excellent coverage and stability for nano to mid-sized reef setups.