[APD] Re:CO2 off at night

["Ann Viverette" <annv777 at houston_rr.com>]

I suspect that as the lights go out, the CO2 that has been captured by
plants but not used leaks out of the plants, sort of the same way that
certain trees in dry regions pull up water from deep water sources but at
night some of this water leaks out creating a bit of moisture to be
exploited by shallower rooted plants. I don't know that this what happens,
I'm just sorta theorizing.

Ann V

>
> Message: 8
> Date: Tue, 16 Sep 2003 10:05:43 -0500
> From: Dan Dixon <dandixon at mac_com>
> Subject: Re: [APD] Re: CO2 off at night
> To: "Aquatic-Plants at actwin_com" <Aquatic-Plants at actwin_com>
>
> gbooth at frii_com at gbooth at frii_com wrote:
>
> > John T. Fitch wrote:
> >
> >> Sorry, but this is not what happens in my tank.  At night, when there
is
> >> no CO2 added to my tank, the pH does *not* go "up as CO2 diffuses out
of
> >> the tank."  The pH goes down from 6.9 (my controller set point) to 6.7
or
> >> 6.6.  How would this be possible if the *net* flow of CO2 is out of the
> >> tank?
> >
> > I can't explain this.
>
> I wonder if this could happen in a heavily planted tank with a relatively
> airtight hood/lid, with relatively small air space, and a heavy fish load,
> thereby creating a situation where nighttime CO2 production is greater
than
> loss from the tank, but daytime CO2 consumption slightly exceeds
supplement
> + production.
>
> Dan Dixon
>
>
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> End of Aquatic-Plants Digest, Vol 1, Issue 51
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