How do we measure that Fe has been taken up via the roots?
I have had a tank using coral chips as substrate -- that is alkaline?
And I also have other tanks using cocopeat topped by inert gravel -- that is acidic?
In both cases, plants grew as well. But redder stem plants don't seem to favour the coral chip substrate.
I think making the substrate acidic will also make the water slightly acidic and optimum for more plants.
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