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I agree, iron improves the greens and maybe other GFPs. However, if you always increase 8 other trace elements also, you may not see the effects you see when increasing iron alone and altering the ratio of trace elements in this way. I think the latter approach is very limited and shows that iron alone has more of a prooxidative effect in contrast to manganese which has more an antioxidative effect.For color I’d say greens have become more vivid no doubt. Kinda hard to say it’s just iron alone though, because I’ve increased about 8 other traces each time I’ve increased the iron, but I believe the iron is causing a vivid green sheen that is just beautiful in the right light.
Yes, this would be my interpretation also.I suspect the biofilm collapsed and released build up nutrients into rock sand etc… so cyanobacteria had lot of opportunities to grow.