No such info as plants uptake of nutrients varies from tank to tank. What you need to do is to dose a complete set of macro and micro nutrients (Commercial liquid fert will do..judge by Fe level of 0.1-0.2)...After you get to this level...check for NO3 level with a test kit..if it is less than 2ppm..dose nitrate by using KNO3 to get it to 3-5ppm or else try dosing more K to see if the nitrate drops over a period of few days..(if nitrate does not drop..some other nutrient is limited and you need to do some investigation)
Plant Physiology by Taiz and Zeiger
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