Most test kits do not work. Other the cal, alk, ph, nitrate, phosphates most are inaccurate. Iodine or mag of most elements are get in accurate its mush better to just have An understanding of what is being removed and add back what's needed. I have dosed just about every element under the sun and have never tested for anything other then cal or alk. I have perfectly healthy growing sps colonies and I do not have any corals, fish, or inverts die or become unhealthy from dosing any elements.
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