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Cyanobacteria in general, and many other bacterial species, have the ability to produce siderophores, which are iron chelators. Each species exhibits, on its surface and in its cellular biochemical mechanisms, specific receptors for the siderophores that produce, but not for the others. Therefore, IMO, the best form of administration would be ferric sulfate, or ferrous sulfate, not chelated iron.
Iron‐limited growth of cyanobacteria: Multiple siderophore production is a common response
Best regards
Iron (III) is not very soluble in seawater, but I suppose even a very small solubility would be a bonus for the organism. Thanks for the heads up. I will take a closer look at cyanobacteria medium recipes.