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Re: [APD] Re: CO2 at night
Quoting Lief Brittan Youngs <liefy at yahoo_com>:
> The fact that plants do not asord CO2 at night is true. They only absorb CO2
> when they can photosynthesise and that is only when there is light. Also,
> they absorb oxygen at night so they can use the CO2 they aborbed when the
> light was on. So, don't consider plants a good source of oxygen for your
> fish. If you need more oxygen use a powerhead or filter but don't rely on the
> plants.
>
> Amazing what I learned in college biology.
>
> Lief Youngs
>
Yes it is true that they absorb oxygen at night, but if you are injecting CO2
and provide good growing conditions, they will produce such large amounts of
oxygen during the day the water will become saturated. They provide more than
enough oxygen to last them (and the fish) through the night, because they
produce much more oxygen during the day then they use during the night. So
despite the fact that they use oxygen during the evening, they are still good
sources of oxygen in general. You can observe this by measuring your oxygen
levels in a heavily planted fast growing tank at various times during the day.
As for using a powerhead to cause bubbles to increase your oxygen, you will
certainly outgas your valuable CO2 and if you have reached oxygen saturation
will probably outgas your oxygen too. If you are going to do this, you
definitely ONLY want to do it at night. At least at night your O2 levels might
be low enough that bubbles might raise O2 levels rather than lowering them.
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