Caribsea Mineral-Mud 1 gallon. 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, seagrasses, macro-algaes, and mangroves, Mineral Mud provides a variety of trace elements, chelated trace elements, natural bio-available iodine, plus calcium, strontium, iron, and free carbon. In addition, Mineral Mud contains live marine bacteria, to complete the tropical ecosystem.