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Hello,

I set up a new aquarium last week and trying to understand my CO2 levels. I have a drop check that stays light green all day and night even after the CO2 has shut off for hours (check it after i wake up). I know this is not normal. I have check it manually by doing the KH chart but i am getting mixed results looking online. Some charts say its to much CO2, others not enough. Currently it is 8-9 KH (8-9 drops to change the color of the solution) and PH is 6.6.

There are no fish in the tank yet so if the CO2 is to hight it should hurt anything right?


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drop checkers tell you what the co2 concentration WAS, 2-3 hours prior. the fact that it is permanently light green means you do not have enough surface agitation and/or injecting at too fast a rate. get a pH pen/monitor it will give you an estimate of co2 in real time.
 
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