Red Sea Reef Coral Colors A Iodine/Halogen complex that promote the pink colors in corals. Coral Colors A Supplement is part of the complete range of complementary major, minor and trace element complexes which together provide the needs of corals. Coral Colors A Supplement contains iodine and other halogens that are associated with many biological processes, one of them being the production of the pink pigments in the soft tissue of corals. The halogens act both as antioxidants and oxidative agents within the soft tissue and mucus layer of corals, reducing the possibility of coral bleaching. In active reef systems, these elements are depleted quickly due to their high oxidative abilities and reactivity with organic materials. Iodine and bromine are related to the pink chromo-protein (pocciloporin). For best results in displaying coral colors use Red Sea's NO3: PO4- X.