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Originally Posted by Jaws
I just don't understand how the Ph level could drop after adding PH buffer.
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My guess is that your pH would have dropped even lower had you not added buffer. pH normally drops overnight. The larger the pH drop, the lower the alkalinity would be in your tank.
Here's a page that explains alkalinity in (painful) detail:
http://www.advancedaquarist.com/issues/nov2002/chem.htm