cannot raise co2 level - The Planted Tank Forum
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post #1 of 5 (permalink) Old 11-30-2009, 10:16 PM Thread Starter
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cannot raise co2 level

I am trying to raise the co2 level. It seems to consistently stay at 4ppm. In my latest effort, I have replaced my Marineland Biowheel mini wave-maker with a Hagen Aquaclear 20 that produces disturbingly little surface movement. I have it loaded with the mechanical sponge, the biomax media and a small bag of peat moss (sphagun or whatever it is called). I left out the carbon as I currently do not have a need for it. I pre-seeded the sponge and the media with bacteria from a heavily populated Cichlid tank for a few days before adding it to my planted tank.

The Tank is a 15g tall (20"wX18"hX12d). It's occupants are a Betta, 3 Neon Tetra's (lost two over the weekend after the filter change) 3 Oto's, 1 Panda Cory (lost 1 a couple weeks ago.) and a few ghost shrimp.

The co2 is from a 3l diy Jello mold producing about 1 bubble every 3-5 seconds.

The PH is consistently at 7.4-7.5. The KH is consistently at 4. With those numbers, I am getting a co2 level of 4 based on the chart that came with the test kit.

Since I removed the biowheel and added some peat moss, shouldn't my co2 have gone up significantly causing my ph to drop?

The test kit is a Tetra Test Laborett kit purchased less than a month ago. I do not see any expiration dates on it. Is it possible the kit is bad?

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post #2 of 5 (permalink) Old 11-30-2009, 10:28 PM
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Your test kit is more than likely not calibrated. The only way to know for "sure" what ppm range is for CO2 is through the use of a drop checker.
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post #3 of 5 (permalink) Old 11-30-2009, 11:21 PM
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how are you diffusing the co2 into your tank?
are you sure that you dont have any leaks in your diy co2 system? check all connections and possible areas that could leak with very soapy water and check for bubbles
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post #4 of 5 (permalink) Old 12-01-2009, 04:45 PM
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I used ot use a test kit, and the results were always showing that I had almost no diffusion. After getting a drop checker, I learned that my diffusion was fine.

I use DIY with a limewood diffusor and my drop checker is always long as I change sugar-yeast solution regularly. (2 bottles alternating to maintain consistancy)

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post #5 of 5 (permalink) Old 12-01-2009, 04:58 PM Thread Starter
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I am using glass and ceramic disk diffuser. I can see the bubbles coming out and most of them never reach the surface before they dissolve. I will look into getting a drop checker. Thank you.
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