Re: [GSAS-Member] CO2 displacing O2 myth

[Susan Welenofsky <welenofsky@comcast.net>]

That's a good rule Paul. Yes, too high of a CO2 will knock a fish out. In fact, 
I read that a way to anesthetize a fish is put it in club soda. I haven't tried 
this method personally, but if I had to put Bio-Bandage on a squirmy fish, I 
might.

Susan


On Dec 31, 2009, at 2:00 PM, 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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