Carib Sea ACS00526 Mineral Mud Filter Media for Aquarium, 1-Gallon

a unique blend of sediments that duplicate tropical fringing coastal mangrove environments. Mineral Mud particles are in a size range compatible with soft, burrowing in faunal, macro animal assemblages. Ideal for mud refugiums, sea grasses, macro-algae's, 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.