I see your point Robert, but... it just doesn't sound right to me. If a little phosphate precipitates a little iron, our tanks would be permanently lacking iron, unless the P happened to be zero.
Obviously that isn't the case, so my assumption is that it has to do with concentrations. You can not put phosphate into your dosing container that includes iron, because it certainly will lead to precipitation. If you are spooning in the stuff per EI, you get problems as well due to the higher concentrations. If I dose 12 ml Flourish Iron and 1 ppm Phosphates over the course of two weeks the concentrations are so low that no precipitation occurs in the tank, even if dosed at the same time.
Of course with all assumptions... you know how that goes.
But think about the coexistence of Iron and Phosphate in a tank.
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