CaribSea Mineral Mud : This is a unique blend of sediments that duplicate tropical fringing coastal mangrove environments. Mineral Mud is in a size range compatible with soft, burrowing infaunal, macro animal assemblages. Ideal for mud refugiums, seaglasses, macro-algaes, and mangroves, Mineral Mud provides a variety of trace elements, chelated trace elements, natural bio-availble Iodine plus Calcium, Strontium, Iron, and free Carbon. In addition, Mineral Mud contains live marine bacteria, to complete the tropical ecosystem. 1 Gal.