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Old 11-03-2011, 03:13 AM   #1
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pH Changes Over a 24-Hour Period???

Just wanted to know if this was true. Got it from a recent book at the library, from 2005-2006 I believe.

During the day
"Carbon dioxide acidifies the water. The plants absorb this for photosynthesis, so the water is less acidic: the pH goes up but stays within the normal values and has no effect on the fish.

At night
"There is no photosynthesis; the plants and fish respire and give off carbon dioxide, therby acidifying the water and lowering the pH value. All these variations are normal."
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Old 11-03-2011, 03:22 AM   #2
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I have no proof but, yes, I have heard that if you check you PH in the morning and check it again in the evening it will be different.
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Old 11-03-2011, 05:24 AM   #3
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I have also read, and experienced that small ph swings happen due to this. I had no idea until I read about it not long ago, and sure enough in my jungle of a tank I checked and there it was.
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