Modern CO2 levels - The Planted Tank Forum
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post #1 of 6 (permalink) Old 04-08-2019, 01:17 PM Thread Starter
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Modern CO2 levels

Hey members,

My old tank ran CO2 at 30ppm.

Tom said 40ppm CO2 is the new recommended level at 2008.
I assume this is for Hi-light tanks.
This means that one would run to get refills sooner at high lighting.

I understand medium light is more manageable.
Medium light at 30ppm will suffice?

see link below:
https://barrreport.com/threads/impor...a-guide.11495/

-Harry
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post #2 of 6 (permalink) Old 04-08-2019, 03:46 PM
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I run my CO2 levels at about 20% with medium light and my plants grow like crazy. I have to do major trimming every two weeks.
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post #3 of 6 (permalink) Old 04-08-2019, 04:40 PM
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Quote:
Originally Posted by Fishworks View Post
...

I understand medium light is more manageable.
Medium light at 30ppm will suffice?

see link below:
https://barrreport.com/threads/impor...a-guide.11495/

-Harry
It doesn't really work that way. Some tanks are fine with much less. it would depend on the setup, plants used, etc. The 30ppm is just a sort of average point where fish are OK and plants are generally getting a good supply.


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post #4 of 6 (permalink) Old 04-08-2019, 08:24 PM
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Nobody knows what their CO2 concentration really is because there is no reliable hobby test. The KH/pH/CO2 tables and the so called pH drops donít do.

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post #5 of 6 (permalink) Old 04-08-2019, 09:43 PM
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Quote:
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Nobody knows what their CO2 concentration really is because there is no reliable hobby test. The KH/pH/CO2 tables and the so called pH drops donít do.
Agreed.

You will never know your true CO2 level.

However, there are benefits to the measurement tools that we have. It allows us to adjust relative values. So accurately measuring your pH is important. To me this means using a calibrated probe.

Once you establish an accurate degassed level, fine tuning your CO2 injection to create a consistent pH drop is well worth the trouble. It does take some trial and error to determine what level brings out the best in your plants and keeps fish healthy.

But it's worth it to get it right, and makes everything else easier. If something is wonky in my tank, the first thing I do is double check CO2.


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post #6 of 6 (permalink) Old 04-08-2019, 11:45 PM
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Agreed @ GreggZ - one thing I have learned is if I calibrate the pH probe monthly, I can be assured that at say 6.3 pH my fish are fine and plants grow nicely. At 6.1pH my fish are in trouble. How much CO2 that is exactly, I don't know, and in some ways don't care.
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