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I'm not sure what the groups collective wisdom is on this topic, but I would think you want to monitor Nitrate levels closely when dosing Nitrogen. In some tanks I have to dose in order to keep Nitrate levels over 5ppm, while in others I'm not dosing and having to pick up the pace with water changes each week.

Do a Nitrate test before the water change and see what it is. Do a check after the water change to see what the adjusted number is, and then do another check a week later before the next water change. That will give you an idea of what your Nitrate change is + or -. If plants are not taking up the Nitrates you don't need to dose or maybe dose as much.
 
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