I only add CO2 during the day.
Chronic high levels can be potentially problematic for animals, bacteria fungi etc.
It also adds a measure of safety since all the CO2 degassess till the next morning.
So you only add CO2 for 10 hours basically.
Plants suck it up and grow like mad.
If my fish have any Kidney damage, I've never seen any evidence nor lost any fish due to CO2 yet. I've killed some shrimp though........
I added CO2 till got no longer got any positive response from the plants.
Beyond that level it becomes wasteful,and with CO2, can kill the fish.
But testing errors and light ballast and electrical current's influence on pH meters can cause issues.
Generally false positives(more CO2 than is really there).
EI is mainly for folks to get a handle on things or to whip the tank into shape for gardening. It assumes max uptake rates(this good advice if you do not know the aquarist tank's details to a large degree), you can back off the dosing of nutrients and see how the plants respond if you so chose. Generally CO2 is not something you want to back off of.
I have tanks I dose nothing to other than fish food also.
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