At the writing of the article he was using a pharmacy available product that he dissolved in RODI water. I have been looking at the Flourish Iron. I can't find info on whether or not it is chelated. I am not entirely sure what chelated is but here is an excerpt from the article...
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I also advise using only iron supplements that contain iron chelated to an organic molecule. The iron sold for freshwater applications is sometimes not chelated because free iron is more soluble in the lower pH of freshwater aquaria than it is in saltwater. I'd avoid those products for marine applications. They will likely still work, as many of the studies in the scientific literature use free iron in seawater, but probably not as well as chelated iron because they may precipitate before having fully fortified the system with iron.
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Does you guys understand the difference? If I do dose Iron, and I think I am going to, I will probably use the Flourish Iron. It seems to be specifically made for what I need. I will try and let you know of any changes I see.