Ensure reef inhabitants and macroalgae receive proper amounts of iodine and iodide with Kent Marine Lugol's Solution Reef Aquarium Iodide Supplement. Iodine and iodide are essential to keeping corals， marine invertebrates and fish healthy. But levels can fluctuate because they are rapidly used by reef inhabitants and removed by protein skimming and ozone. Kent Marine Lugol's Solution Reef Aquarium Iodide Supplement provides a strong source of free iodine and iodide. It's very effective when used with stony corals， systems containing xenia and soft corals and can be used as a dip for stony and soft or leather corals to eliminate unwanted parasites and harmful bacteria. Kent Marine Lugol's Solution Reef Aquarium Iodide Supplement helps foster improved coloration and prevents bleaching of all corals due to changes in light intensity， and enhances coral polyp expansion.