up to .25 pH swings at night - too much? - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 04-10-2005, 10:02 PM Thread Starter
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up to .25 pH swings at night - too much?

Obviously due to high co2 levels, I have been getting a pH variance of .25 over each night. It is normally 6.9 during the day, and reaches as low as 6.65 at night and early morning before the lights turn back on. the co2 variance is between 25 and 38 ppm (day/night). I have not noticed any harm to the fish or any gasping. However, them constantly adjusting to new pH worries me.

other than buying a pH controller, is there any alternative to fight this? airstones at night to help remove the excess co2 maybe?

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post #2 of 7 (permalink) Old 04-10-2005, 10:50 PM
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I would not worry about .25 fluctuations.

Besides closely monitoring your fish and backing off a little if they look unhappy, and besides the airstone, and besides buying the controller, you could buy a solenoid and put it on a timer.

That way you save the dough for the controller, save CO2 that's not needed at night, and make your fish feel better. Bingo!


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post #3 of 7 (permalink) Old 04-10-2005, 10:57 PM Thread Starter
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i have a solenoid right now on my co2 tank. i would have just figured that the lack of pumping co2 in the tank for that long would make for wilder pH swings.

if I cut off the co2 flow for 12 hours a day, would the pH swing much?

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post #4 of 7 (permalink) Old 04-11-2005, 01:32 AM
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Well, if you have a solenoid, put it on the timer along with the lights. If you notice the pH swinging the other way (going up over night) then just buy a separate timer and set it to whatever time so the pH is the same in the morning and evening. For example, if it is now 6.9 in the evening, turn the CO2 off for 4 or 6 or 8 hours and see what it is in the morning until the swing is minimal.

I turn off CO2 over night not because of pH swings, but to conserve CO2. The pH might go up a little over night but I haven't seen any fish complaining


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post #5 of 7 (permalink) Old 04-11-2005, 02:26 AM Thread Starter
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have you noticed any problems with your bubble count changing after each on and off, or does it go back to normal fairly consistently?

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post #6 of 7 (permalink) Old 04-11-2005, 07:02 AM
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I have had large ph swings in my tank plenty of time. Sometimes dropping from 6.8 to 6.2 overnight. Not that is good for the fish, but I have yet to see a single fish gasping for air.

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How comes shoppings so stupid, looks at all this stuff I haves, what do I do's with it.
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post #7 of 7 (permalink) Old 04-11-2005, 08:26 AM
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I have a ph controller, but decided to shut off CO2 at night. PH swing up to 0.7(6.7 - 7.4). Did not notice any ill effects on fish, including discus.


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