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Old 11-18-2011, 04:40 PM   #1
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pH swing - please help

What would cause a sudden pH change? I tested water parameters because fish were behaving oddly; not swimming just hanging out on the bottom. The pH has been stable since the beginning at 7.8; today it's now 8.2. This is a 30 gallon tank that's been fully cycled for a few weeks.

What should we do now?

Other test results:
ammonia 0
nitrite 0
nitrate 10
SG 1.026

D & J
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Old 11-18-2011, 06:14 PM   #2
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It's very normal for the pH to fluctuate. It's usually lower in the AM and gets higher during the day when the lights are on. Nothing to worry about.
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