CARIBSEA Mineral Refugium Aquarium Mud (1 Gallon) is A unique blend of sediments that duplicate tropical fringing coastal mangrove environments. Its particles are in a size range compatible with soft, burrowing infaunal, macro animal assemblages. Ideal for mud refugiums, seagrasses, macro-algaes, and mangroves, Mineral Mud™ provides a variety of trace elements plus calcium, strontium, iron, sulfur and free carbon. In addition, Mineral Mud™ contains live marine bacteria to complete the tropical ecosystem. Bring a bit of the Caribbean home with CaribSea, Inc., maker of environmental accessories for aquariums. CaribSea Mineral Mud Refugium Substrate is a blend of sediments that duplicate tropical fringing coastal mangrove environments. Compatible with soft, burrowing infaunal, macro animal assemblages, Ideal for mud refugiums, seagrasses, CaribSea Mineral Mud Refugium Substrate has trace elements plus calcium, strontium, iron, sulfur and free carbon. Mineral Mud™ Refugium substrate The benefits of mud without the mess – a proven performer Mineral Mud™ – A unique blend of sediments that duplicate tropical fringing coastal mangrove environments. Its particles are in a size range compatible with soft, burrowing infaunal, macro animal assemblages. Ideal for mud refugiums, seagrasses, macro-algaes, and mangroves, Mineral Mud™ provides a variety of trace elements plus calcium, strontium, iron, sulfur and free carbon. In addition, Mineral Mud™ contains live marine bacteria to complete the tropical ecosystem. About 82 pounds per cubic foot. follow us on : https://www.instagram.com/seapearlsaquarium/?hl=en