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[APD] iron:copper ratio
I know that too much copper can be a bad thing, but some is required by
plants. The iron:copper ratio in my trace elements mix is about 10:1.
So if I dose 0.1ppm iron, copper would be around 0.01ppm. Does this
ratio seem reasonable? What minimum ratio would be safe to use to avoid
accumulation to unaceptable levels over time? (assuming iron levels are
kept in check, this is the only source of copper and regular tank
maintenence is observed).
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