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Activated Charcoal

I have been using activated charcoal in my filter system (Magnum 350).
Looking through the archives, I've found mixed messages about whether
activated charcoal is beneficial in a planted aquarium.
I am good about water changes ... and have no problem with algae.
However, my test kit (thanks Dave Gomberg) registers no Fe at all ... even
after adding fertilizer.
Is there a consensus on whether activated charcoal is needed?