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That pH level is normal for a tank in a house. The buildup of carbon dioxide drops the pH a bit for most setups. The "buffer" products work by consuming carbon dioxide from the water column (more or less) and adding alkalinity, so the effect is very temporary. Aeration brings the pH back down fairly quickly. I'd just ignore the pH. As long as the alkalinity is in the 7-11 dKH range, the tank likely will be fine.
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Jonathan Bertoni
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