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If I use the timer to turn on the CO2 tank in the morning and off in the evening, there would definitely be a change in pH. Would pH level jump a lot if I did that? And would that change in pH affect the fish?
 

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Interesting article Zapins.
 

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If I use the timer to turn on the CO2 tank in the morning and off in the evening, there would definitely be a change in pH. Would pH level jump a lot if I did that? And would that change in pH affect the fish?
I use a timer on all my tanks and the CO2 goes from normal levels to 30ppm in a few hours. pH drops by about 1 degree when the CO2 comes on and the fish are fine. It then rises back once the CO2 goes off. I have various species breeding in my tanks, including killies and Apistogramma.

Most fish are adapted to cope with varying pH, O2, temperature and CO2 levels in the wild, especially those from little streams and ponds, and have mechanisms, such as the two types of haemoglobin among other things, to deal with it. I wouldn't push it with fish that like alkaline conditions though.
 
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