Iodine is a chemical element with the symbol I.
Iodine is extremely important for most reef species, especially invertebrates require it to sustain their cell functions. The iodine concentrations in the different oceans across the world varies from 0.025 – 0.064 mg/l.
Many colors of corals in salt water aquariums are strengthened by iodine – especially in combination with potassium. Supplementing iodine can visibly improve an iodine shortage in many corals in as little as two weeks. Especially Xeniae and bubble corals proliferate well with sufficient iodine supplies.
The iodine concentration in a salt water aquarium should mimic the natural values and range between 0.02 and 0.06 mg/l.