Re: [GSAS-Member] CO2 displacing O2 myth

[Kathy Olson <kathy@thekrib.com>]

Hi,

We had a CO2 reactor that got stuck and dumped a whole tank of CO2 in the 
tank over a few days.   That time the fish were all gasping for air or 
trying to air breath at the top.

I like what you wrote below though.  I wonder why, they were at the top 
and not the bottom?

Of course, I didn't figure it out, went on a trip and came home to a 
completely empty fish tank and co2 tank (it was a 2 week trip).

Kathy


--
Kathy
"Perhaps wisdom is simply waiting, and healing a question of
time. And anything good you've ever been given is yours forever.".....from
Kitchen Table Wisdom by Rachel Naomi Remen




On Thu, 31 Dec 2009, Paul M. Wallace wrote:

> The myth is that adding CO2 drives out O2.  I would like to add the other
> perspective:
>
> Due to chemistry, CO2 and O2 do not displace each other at the
> concentrations we run.  From
> http://fins.actwin.com/aquatic-plants/month.9812/msg00530.html (Karen
> Randall in 1998)
>
> "CO2 and O2 do not displace each other at the levels we want in an aquarium.
> Saturation in a typical tropical FW aquarium is a little over 8 mg/L. (it
> will be a little less at the warmer temps in a discus tank)  My high growth
> CO2 supplemented tanks run at about 11 mg/L O2 during the photo period, and
> drop only to about 8 mg/L over night. (with the CO2 still running)  You'll
> be hard pressed to maintain O2 levels near that in a non-planted tank, no
> matter how you aerate it."
>
> The old rule of thumb is listless at the top -> low O2.  Listless at bottom,
> high CO2.
>
> -Paul
>
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