Depends more on the type of fertilization and "tech" type.
The E.I. (estimative index) method calls for adding more than enough ferts to keep from being limited in any of the, followed by a 50% waterchange after the week to reduce excess. A high light tank also requires more ferts and needs the change to keep from building up also. Low tech tanks and fewer plants require less ferts and thus less waterchanges.
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