PH swing during the night - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 01-26-2009, 11:27 AM Thread Starter
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PH swing during the night

I'm running pressurized CO2 and a PH controller. I also have this on a timer. How much ph swing is ok? Currently the PH is set at 6.5 during the day and during the night it will get up to 7. Should I just let the controller handle the ph?
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post #2 of 5 (permalink) Old 01-26-2009, 07:09 PM
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It makes no difference how much the pH swings or doesn't swing. It is a non-critical parameter for a planted tank. It may be as low as 5 or as high as 8 without the tank occupants noticing anything amiss. This is assuming we are just talking about the effect of CO2 on the water. Long before the pH will drop far enough to harm the fish, they will be dead from suffocation from the CO2. Think of the pH as an effect of something, not as a primary parameter of the water.

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post #3 of 5 (permalink) Old 01-26-2009, 07:10 PM Thread Starter
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Thanks, just wanted to make sure.
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post #4 of 5 (permalink) Old 01-26-2009, 07:12 PM
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The pH swings are perfectly safe, provided they are the result of CO2 concentration changes. Imo, if you have the controller, you might as well use it full time, the amount of gas you save with turning off the timer will be negligible, and one less piece of equipment.
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post #5 of 5 (permalink) Old 01-26-2009, 07:43 PM Thread Starter
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Could use the timer somewhere else. I think I will remove the timer and just let the controller keep the ph steady.
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