Component C is designed for complementing minor deficiencies of iodine and fluorine in a marine aquarium. Skimmer and filtration media tend to remove trace elements from the water of closed aquarium system, making micro nutrients supplementation necessary. In marine aquariums, iodine is responsible for the general cells functioning and for the transfer of nutrients. Fluorine takes part in the calcification process and supports skeletal tissue development. The use of Component C ensures keeping the content of iodine and fluorine in water at the same level as in natural seawater. Due to the perfect balance between the content of iodine and fluorine, Component C strengthens the coloration of hard corals. It significantly affects the intensity of blue and violet coloration, and also emphasizes the white coloration of SPS corals. Safe concentration of the preparation minimizes the chance of micro nutrients overdose, therefore Component C can also be used by novice aquarists.