Stablizing CO2 Level - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 10-11-2007, 04:53 PM Thread Starter
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Stablizing CO2 Level

My tank has a KH of 11 so according to the chart and my DC the pH should be at about 7.0 to have a CO2 level of 30.

Overnight my pH raises to 7.5 and if I set my bubble counter at 1dps the CO2 slowly rises to 30 over about 6 - 8 hours and then stays there.

If I increase to 2dps then the tank rises to 30 much quicker but it continues to rise to about 40 by the end of the 12 hour light period.

Is it normal to take the CO2 6-8 hours to rise to the desired level?
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post #2 of 7 (permalink) Old 10-11-2007, 04:56 PM
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pH/kH isn't really the best way to check CO2 levels in a tank. Get a drop checker with reference kH solution and use that instead.
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post #3 of 7 (permalink) Old 10-11-2007, 04:58 PM Thread Starter
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Quote:
Originally Posted by epicfish View Post
pH/kH isn't really the best way to check CO2 levels in a tank. Get a drop checker with reference kH solution and use that instead.
I do use a DC (drop checker) and it pretty much coincides with the chart.
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post #4 of 7 (permalink) Old 10-11-2007, 05:06 PM
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Quote:
Originally Posted by fourtanks View Post
I do use a DC (drop checker) and it pretty much coincides with the chart.
Er, right...I completely missed that. My bad.

What's your diffusion method? I use a DIY in-line reactor on a Fluval 404 for my 40 gallon breeder tank. I hit optimal levels of CO2 within 45 minutes of having it injected. The CO2 comes on about 30 minutes before the tank lights come on.
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post #5 of 7 (permalink) Old 10-11-2007, 05:20 PM
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In addition to what epic said,
Drop checkers are accurate, but they aren't like a digital thermometer. It takes some time for the change to show.

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post #6 of 7 (permalink) Old 10-11-2007, 10:46 PM
 
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Originally Posted by tazcrash69 View Post
In addition to what epic said,
Drop checkers are accurate, but they aren't like a digital thermometer. It takes some time for the change to show.
It took around 2-3 hours before it reads accurately.
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post #7 of 7 (permalink) Old 10-11-2007, 10:55 PM
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At 1 bbs, taking 4-5 hours for my pH to drop sufficiently is consistant w/ what my auto pH probe reading says too. It takes a while when you turn off CO2 at night. That's why I like the auto pH option. I set my regulator to pour on the CO2 to get my levels to where I want them within 1 hour, then my lights turn on. The auto pH sensor keeps me from ODing the tank if that makes any sense. The advantage, optimum CO2 levels for 100% of the ligts on time. I also turn the CO2 off arround 1 hour b4 lights off to help gas out some of the CO2 before my plants stop putting of O2 when lights go out to keep from over stressing my fish.

Just my experience.
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Last edited by Tdon1md; 08-22-2011 at 01:07 PM.
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