Join Date: Dec 2013
Location: SF Bay Area, California
How much of a pH swing? From what to what?
It's normal for pH to drip at night from CO2, as explained by Axelrodi202. They're gradual so no one in the tank is harmed in the process. If you run CO2, turn it off at night. Unless there's something unusual going on and the pH drops obscenely low, I wouldn't worry about it.
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