Maintaining proper iodine levels encourages crustaceans to molt, it encourages the growth of soft corals such as leather corals, mushroom corals, and zooanthid polyps, and it can lead to more colorful stony corals. For iodine for saltwater aquariums we carry Fauna Marin Trace I Iodine & Brightwell Iodide (aka iodine) & Lugol's supplements.Related Articles:Using Iodine: Lugol's Solution

From the Using Lugol's Iodine Solution As an Iodine Coral Dip for Corals, and as a Supplement & Medication Article:
Lugol’s solution is one of the oldest, most common, and most versatile aquarium additives. It's a highly concentrated form of iodine that can serve a few useful roles in a reef aquarium. We carry Brightwell Aquatics Lugol's Solution.

Lugol’s as a Supplement
Lugol’s solution is most commonly used to supplement the aquarium with iodine and iodate. This has a wide variety of benefits. Maintaining proper iodine levels encourages crustaceans to molt, it encourages . . . continued