ACP Iodide is essential minor component / element / ion in natural sea water. ACP Iodide replaces coral metabolized iodide and safe guards against possible goiter symptoms exhibited by long term captive marine fish. ACP Iodide is an easy to use and ideal additive that will replace iodide metabolized by corals. Maintaining proper levels of Br- (#7) and Iodide (#8) can safe guard against possible goiter systems exhibited by long term captive marine fish. ACP Iodide will not alter pH. ACP Iodide should be used when mixing all one step marine salts and on a regular basis between routine water changes.