Never said nor implied Fe2+ vs Fe3+ was useless.

Plants will take in either form and then they have their own endogenous chelator which uses a Fe3+ cation, not as Fe2+ which is rare in general and with that extra electron, pretty nasty inside unless you have tight regulation, which the plant does.

I just do not buy the reasoning that it's better than any other chelator based on energy requirements at the whole plant level and no one has ever shown that, it's speculation, not plant physiology, on Greg's part.

I've used more than just Seachem and several other chelators for traces over many years, I'd like to see if anyone could prove a difference.
I could not at least in terms of growth rates/dry weight biomass etc.

I do not think Greg nor any aquarist has/will any time soon either.


Regards,
Tom Barr