Code: AQ19007Advanced Supplements for Marine Aquariums Iodine Concentrate - use this solution to maintain the iodine level in reef aquariums, which benefits moulting crustaceans and promotes vitality and bright colouration in corals, anemones and Tridacna spp. clams. Iodine Concentration also helps prevent bleaching in corals, and is especially useful for the cultivation of Xenia and other delicate soft corals. 250ml