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Discussion Starter · #1 ·
Does it? The only variable that would cause the swing is CO2 during the day and lack of it at night. At night, my pH is around 7 to 7.3. During the day, it is around 6.4 to 6.8.

dh is at 3 consistently.
gh is at 4 to 5 consistently.
 

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I have wondered about this but on a larger scale. I have plants in a tank that has been at about 6.5, whereas my tap water comes out at 8.2. I reduce the pH using API drops and peat. This means that sometimes in my tank the pH can swing pretty drastically in one day. I have frequently wondered if this was bad for my plants (and fishes) so I am glad someone else has sort of the same question even though the details are a bit different. I am interested to see what other members here think.
 
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