pH going from 6.8 to 7.6. - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 07-17-2013, 06:19 PM Thread Starter
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pH going from 6.8 to 7.6.

At the end of the evening when my air stone has been off the longest and my co2 and lighting has been running all day my pH is 6.8. My light cuts off at 10pm and the air stone kicks on (diy co2 stays on 24/7). After 10 hours with the airstone on and the light off my pH is 7.6.

I don't know if this is a crazy swing in pH. My question is how serious is this difference and what does it say about my co2? I got my drop checker yesterday and it was just turning green before the light kicked off.


BTW I realize the reason for the pH swing is the lack of light and the air stone. I'd rather go from 6.8 to 7.6 than from 6.8 to 6.0 (light and air off).
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post #2 of 8 (permalink) Old 07-17-2013, 06:30 PM
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don't worry about it. pH drops from the co2 being in the water. It goes through a chemical process that releases an acid, hence the pH appearing to drop. this drop isn't a concern.

it goes up after your co2 is off because that reaction is no longer occurring. no biggy! it just means you're getting good co2 dissolution in the water.


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post #3 of 8 (permalink) Old 07-17-2013, 06:36 PM Thread Starter
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Originally Posted by scapegoat View Post
don't worry about it. pH drops from the co2 being in the water. It goes through a chemical process that releases an acid, hence the pH appearing to drop. this drop isn't a concern.

it goes up after your co2 is off because that reaction is no longer occurring. no biggy! it just means you're getting good co2 dissolution in the water.
So I don't need to stop running my air stone at night? I was concerned that during the day when it was off my fish would suffer so I let it run at night. Also, I know that the plants dont' use the co2 when the lights are off so I figured the air stone would remove some co2 since it runs 24/7 and give my fish some relief at night.
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post #4 of 8 (permalink) Old 07-17-2013, 06:49 PM
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What is the size of the tank, and how are you diffusing CO2? I doubt you have to worry about gassing the fish with DIY in any case.

I would opt for not running the air stone at night just to stabilize the CO2 levels, reducing the likelihood of BBA.

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post #5 of 8 (permalink) Old 07-17-2013, 06:53 PM Thread Starter
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What is the size of the tank, and how are you diffusing CO2? I doubt you have to worry about gassing the fish with DIY in any case.

I would opt for not running the air stone at night just to stabilize the CO2 levels, reducing the likelihood of BBA.
It's a 25T (0 ammonia, 0 nitrite, >5 nitrate) with a glass ceramic diffuser. I use two 2 liter bottles for DIY. If my new drop checker is accurate I'm between 20 and 30 ppm co2. It's green but not deep green. I was worried that if I don't run the air stone at night the co2 might drop the pH from 6.8 to even lower. It goes up to 7.6 during the night. If it goes 0.8 the other way it'll be 6.0 and that would worry me. Unless I pull the co2 and the air at night but then I worry I'm not getting the air my fish need. I have 5 black skirt tetras, 8 neon tetras, 2 cory catfish, and 1 ADF.
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post #6 of 8 (permalink) Old 07-17-2013, 07:17 PM
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i never run an airstone, but i also turn off my co2 with the lights.

you don't have the same option with the DIY set up unfortunately.

I highly doubt your pH would drop any more than that at night. how is the water surface?

if it's rippling without breaking the water's surface, you're going to have good gas exchange for oxygen. i wouldn't worry about it at that point


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post #7 of 8 (permalink) Old 07-17-2013, 07:28 PM Thread Starter
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Originally Posted by scapegoat View Post
i never run an airstone, but i also turn off my co2 with the lights.

you don't have the same option with the DIY set up unfortunately.

I highly doubt your pH would drop any more than that at night. how is the water surface?

if it's rippling without breaking the water's surface, you're going to have good gas exchange for oxygen. i wouldn't worry about it at that point
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post #8 of 8 (permalink) Old 07-18-2013, 02:00 AM
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Fish do not mind the pH swings because of CO2.
Here is one way to 'turn off' the DIY CO2:
Set the bottles on top of the light. When the light turns on it warms up the yeast, and the yeast produces more CO2. When the lights turn off the yeast cools off.
Not great, but something.

In a tall tank you may be getting some benefit from the increased circulation of the bubbler. If you stop using it, watch the tank to be sure things are still OK.
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