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[APD] Barr Method Question


I have decided to try the "Barr Method" but have question. I am concerned about nutrient build up in the tank. Even with 50 % weekly water changes and assuming no plant up-take (bad assumption I know), the nutrient levels would continue to rise in the tank. How does one determine plant up-take (is there a rule of thumb?) in the tank without testing since Thomas Barr has indicated that testing isn't really necessary except to determine CO2 levels. Is it just a matter of testing until you get a "feel" for the nutriant levels in the tank over a period of time and then dose base on the your experience and appearance of the plants. Any assistance would be of help.


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