Co2 AND pH QUESTION - The Planted Tank Forum
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post #1 of 4 (permalink) Old 03-26-2019, 02:29 PM Thread Starter
Algae Grower
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I turn my Co2 on 2 hours before my lights turn on and my Co2 turns off 1 hour before lights turn off. Is there a problem if my pH rises more than 1 point after lights turn off or lower than 1 point when lights have been on for a few hours?
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post #2 of 4 (permalink) Old 03-26-2019, 05:40 PM
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It's my understanding that ph changes of that amount that are caused by Co2 exchange are not harmful to fish.
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post #3 of 4 (permalink) Old 03-26-2019, 06:47 PM
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pH swings due to varying carbon dioxide levels are probably pretty normal in Nature, but more than 1 point would make me a bit nervous if it was my tank. (My pH drops about 0.7 points when I carbon dioxide inject.)

Can you test for dKH and let us know the value? I'm wondering how well buffered your tank is.
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post #4 of 4 (permalink) Old 03-26-2019, 06:51 PM
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up to 1.3 seems to be fine.

anything more is where we see issues, but it depends on other tank parameters.

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