I am not dosing NO3 at the moment. But I am dosing PO4 at about 4ml per week at 0.44 ppm.
To dose or not depends on your water conditions. As long as you have about 5 - 10 ppm of NO3 and 0.2 - 1.0 ppm. You should have sufficient. Most important is to read the response from the plants.
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