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I do alot of my own research, but for some reason am having a hard time, as to what levels each of these elements need to be for optimum macroalgae health. I've run refugiums and reactors for years with good results, but still maintained regular water changes with quality salt to rely on replacing used elements. I now run fowlrs only, and really not doing water changes at all anymore. I've gotten serious about the care for refugiums and believe these are the 2 vital elements for macro health. I've studied the formulas that specifically target macro and found them to be unnecessary. I will be using the Brightwell products, Ferrion and Iodion, I've always had good success with Brightwell products. I only dose what I can test for, so I'll be using the Salifert Iodide test and the Seachem Iron test, I am considering the Hanna Iron test once I learn the proper level of concentration. Any experience with the testing options would also be appreciated. So what level of Iron and Iodide?