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Thread: Theory, Co2 + Plants + aeration

  1. #1
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    Theory, Co2 + Plants + aeration

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    I just wonder why this wouldn't work.

    if you have lots of surface movement = lots of gas exchange right.

    so if you have a planted tank with surface movement,
    won't the plants take in all available co2 from the water, leaving a deficit which the surface movement will caused more co2 to be dissolved, leaving a constant co2 % that's the same as atmospheric conditions?

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    Should work. But plant growth will not be as fast as those tanks being fertilised specially with CO2.
    koah fong
    Juggler's tanks

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    CO2 is more difficult to dissolve in water, so your theory of air exchange does not provide enough CO2 gas. In fast flowing streams/rivers, most CO2 for plants comes from fishes.

  4. #4
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    wks, CO2 dissolves more easily in water than O2. But O2 (21%) concentration in air is higher than CO2. In nature, plants do not get CO2 from fish. It is neither sufficient nor efficient.

    loupgarou, you can aerate the water to maintain Co2, but the concentration will never exceed 3-4ppm. Compared with the 12-30ppm that you inject into the water, this is really nothing. If I remember correctly, Diana Watsland quoted the growth rates to be 10X faster with 12ppm of CO2.
    Also, while it rids the excess CO2, it also rids the water of excess O2. So no bubbling.

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