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Re: Shelf life of Flourish/Substrate iron
This has not been my experience. I use a 50/50 mix of relatively fine gravel and
Seachem's Fluorite substrate which (they say) has iron in it. I have found that
if I do not dose with supplemental iron the leaves of my normally red-growing
plants start growing green. I dose with iron, they turn red again. Now, this may
be because the plants have a hard time getting at the iron in the substrate, but
I'm not sure they aren't using all the iron available to them, as I have 260 watts
over a 60 gallon and fairly high CO2 levels. Is it possible I simply have more
photosynthetic processes that use more iron than in some other tanks?
Justin Collins