Re: powerhead
If the air in the tank room is high in CO2, the tank will reflect that by having a lower pH overall. However, if you have windows open during the day and closed at night, pH will be normal during the day and much lower at night. High swings in pH with normal CO2 in the tank room reflects a low alk.
The 9.6 and 8.6, are these alk or pH readings?
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