Re: NANFA-- The dissolved oxygen thang

Mark (
Mon, 20 Jan 2003 14:34:21 -0500

I know CO2 level can change with respirating animals in the room. I used
to do indoor air quality work and used a CO2 meter. I think normal outdoor
levels were something like 300 ppm. I sometimes measured indoors levels
over 1000 ppm. I'm still not sure those kinds of changes would be
significant as far as fish comfort in the water. I would like to see an
experiment with two identical tank set ups, one with oxygen-depleted indoor
air and one with unaltered outdoor air that is at the same temp as the
indoor air. Then take DO readings with a good meter.

At 6:28 AM -0500 1/20/03, geoff wrote:
>lower solvent temps -> increased solubility of gases

Yeah, but what about high solvent temp with low-temp gas? That is the
scenario I was asking about based on Todd's observations. Todd had warm
water, but got better O2 dissolution with outside air. Is that difference
due to the air O2 levels or something else?

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