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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).

Clint Brearley
Melbourne, Australia

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