Koral MD Professional Coral & Frag Dip does not contain iodine. It is a professional strength prophylactic cleaner, dip and conditioner for use in cleaning new corals, live rock, and empty coral fragging & holding facilities. It will assist in cleaning corals prior to acclimation into the aquarium and prevent the transfer of unwanted substances. It will assist in acclimating newly fragmented corals and washing new or damaged corals. It is safe for dipping stony and soft corals, sea anemones, mushroom anemones and zoanthids. It is excellent to use to wipe down or soak holding facilities or old aquariums for re-use (rinse well after use).