Supplement containing concentrated iodine. In marine aquariums iodine is crucial for general cell functioning and the transfer of nutrients between them. Iodine is constantly consumed by tank inhabitants, therefore, without supplementation its level drops quickly. Iodine is used by corals for synthesizing pigments which allow them to adapt to variable lighting conditions and protect the fragile coral tissues from UV radiation. Iodine intensifies dark blue and purple colouration of hard corals. Appropriate iodine content in seawater tank supports shrimp molting. Regular dosage of Iodum keeps iodine content at the same level as in natural seawater.