Coral Colors B Potassium complex that promote the Red colors in corals K & Trace elements Coral Colors B Supplement is part of the complete range of complementary major, minor and trace element complexes which together provide the needs of corals. Coral Colors B Supplement contains potassium and boron that are associated with many biological processes, one of them being the production of the red pigments in the soft tissue of corals. Potassium plays an essential role in the transportation of coral nutrients within the soft tissue (including the nutrients provided by the zooxanthellae). Potassium and boron significantly affect the alkalinity of a coral’s soft tissue and the formation of aragonite in its skeleton. Potassium is related to the red chromo-proteins. For best results in displaying coral colors use Red Sea’s NO3: PO4– X.