PH and Co2 limitations of aquatic plants - The Planted Tank Forum
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post #1 of 6 (permalink) Old 04-29-2017, 07:53 AM Thread Starter
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PH and Co2 limitations of aquatic plants

Does anyone know of, found reference to material or have an educated guess as to what the lowest PH value is needed to sustain aquatic plants (generally speaking) and the same for Co2 concentrations if they become deadly or detrimental at high concentrations and how much? I know each species is different but I have an off the wall idea I would like to run some tests on and would like to try to find a rough idea of where to start to save some wasted time.

Any help would be much appreciated

Dan
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post #2 of 6 (permalink) Old 04-29-2017, 08:29 AM
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No idea but now I'm intrigued in what you are planning to do

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post #3 of 6 (permalink) Old 04-29-2017, 02:45 PM
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A rough PH estimate would be around 4. Many aquatic plants extract carbon from other sources when CO2 is not present. So theoretically a CO2 level of 0 could sustain an aquatic plant.
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post #4 of 6 (permalink) Old 04-29-2017, 02:57 PM Thread Starter
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A rough PH estimate would be around 4. Many aquatic plants extract carbon from other sources when CO2 is not present. So theoretically a CO2 level of 0 could sustain an aquatic plant.

Thanks Zorofox. I was looking at the upper limitations like 1000ppm 10,000 ppm etc. Any idea on that?

Dan
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post #5 of 6 (permalink) Old 04-29-2017, 03:17 PM
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Thanks Zorofox. I was looking at the upper limitations like 1000ppm 10,000 ppm etc. Any idea on that?

Dan
Obviously, the inhabitants (including bacteria) would have an upper limit. I'm not aware of any toxic CO2 level for aquatic plants. If you think about it, aquatic plants can easily tolerate CO2 levels of 400ppm, think of an emmersed setup. Atmospheric levels average about 400ppm. There have been studies showing decreased yields in terrestrial plants with high CO2 levels, approximately 2,500ppm. However, those levels would be impossible to reach in a typical aquarium.
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post #6 of 6 (permalink) Old 04-29-2017, 07:53 PM Thread Starter
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Perfect thanks again... I'm interested to see the results.

Dan
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