The Planted Tank Forum - View Single Post - Do changes in pH due to CO2 affect fish?
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Old 01-21-2013, 11:31 PM   #5
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In short: no, CO2-related pH changes won't hurt your fish. Hardness (KH & GH) remain the same and it is way more important than pH. It's the carbonic acid that causes the pH "swing" in your tank.

If you use the search feature here on the forum, you'll find dozens of threads that go extremely in-depth on the matter.
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