Best advice I can say is watch your plants. If your doing ei slowly reduce individual ferts until u notice deficiency. They sell tests to measure fert levels but watching your plants and observing algae is best.
For example, I have been dosing modified ei for non co2 tank. I just started a plant wall with about 40 different anubias and java ferns and in three days my nitrates bottomed out, as per watching my plants, and so did potassium. Soo, I will be upping them and watching how the plants react.
If in doubt, add more plants!
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