FWIW, I rarely have used gfo but have spurred on dino/cyano out breaks by heavy over feeding.
Iron is necessary to their existence as it is with most all life. However, since most can benefit from photosynthesis iron plays an important part to the synthesis of chlorophyll. Deplete iron and you hinder their ability to do so. Keep in mind this also applies to other photosynthetic organisms in your tank like corals or anemones.
I do dose a diy iron citrate solution regularly for my ATS. Does not seem to effect my cyano/dino population which is not noticeable currently with the naked eye.
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Current Tank Info: 180g mixed reef w/ a beananimal overflow to a dolomite RRUGF. | 20g long G. Smithii Mantis Tank
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