Mineral Mud 3.8L

CaribSea’s Mineral Mud is a unique blend of sediments that
  duplicate tropical fringing coastal mangrove environments. 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.