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Re: CO2 and anabantoids

>> the notion that co2 escapes from the water and then "loads" the air 
>> above for a significant period of time is silly. if that were the case,
>> then by the law of partial pressures, recently elucidated on this list,
>> part of it would dissolve back into the water and the tank co2 level
>> would be higher than ambient room air.
>> dinyar
> Why would this be silly. If there is a continuous supply of CO2, it
> may accumulate above the water surface even if part of it dissolves
> back into the water. The worrying thing is that CO2 is heavier than
> regular air. Hence, with a tightly fitting cover, there may be an
> oxygen-free, CO2 loaded layer above the water surface. If the cover
> does not fit tightly, this problem is less likely to arise because of
> air circulation.

It would have to be very tightly fitting indeed.
> Again, this may potentially cause problems only for anabantoids,
> because they breeth atmospheric air rather than oxygen dissolved in
> the water.
> Jan

not only for anabantoids -- lots of fish, eg, many catfish families,
breath atmospheric air. With an air tight cover, you'd have problems
with or without CO2.