Planted Tank Guru
Join Date: Mar 2006
Location: Indianapolis, IN
Macros are needed in large amounts by plants -
Nitrates, Phosphates, Potassium and Carbon (from CO2) are considered macro nutrients.
Traces, like in Plantex CSM (Magnesium, Copper, Iron, Maganese, Calcium, Zinc, etc) are micros.
Some argue about iron - it is like a macro-micro. You need more of it than the other traces a lot of times.
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