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What is "slightly lower", "higher" or "much lower"?
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In an earlier article in TFH there was more specific guidance on CO2.
Amano indicates assuming an original PH of 7.0 if water becomes slightly acidic 6.8 to 6.6 with CO2 injection while plants are vigorously photosynthesizing you can consider the CO2 level is adequate. If CO2 is depleted then the PH will rise and CO2 is inadequate.
In the Nature Aquarium, it is indicated that fertilization should be adjusted based on plant volume.
Also, N and P are not dosed but if there are signs of deficiency that they should be dosed.
This system assumes that you are ‘in tune’ with your aquarium.