Seachem reef iodide is a concentrated 8 000 mgl stabilized potassium iodide source for reef aquaria that will restore and maintain iodide levels to those found in natural sea waterr it is formulated to provide a safe source of iodide that will not convert to toxic free iodine under storage or reef conditionsr iodine is as toxic as chlorine and should never be used in a reef system however iodide is as safe as chlorider iodide is an important element required by invertebrates and many sof