which has more co2?

AFAIK, CO2 levels can increase in the water if there is a lack of adequate circulation, a heavy film on the surface, or anything else that prevents the exchange of CO2/O2 at the surface. In regular conditions (circulating water, surface of the water being broken by airstone bubbles or filter outflow), I believe the CO2 in the water and atmospheric CO2 equalize, but I could be wrong.
 
Every once in a while i get a film on the surface. I try to suck it up, but would it be more beneficial to keep it there, because i only have diy co2?
 
Blinky said:
AFAIK, CO2 levels can increase in the water if there is a lack of adequate circulation, a heavy film on the surface, or anything else that prevents the exchange of CO2/O2 at the surface. In regular conditions (circulating water, surface of the water being broken by airstone bubbles or filter outflow), I believe the CO2 in the water and atmospheric CO2 equalize, but I could be wrong.
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thanks blinky :)
 
I searched the net quickly, and found several sources that said that the amount of CO2 in our atmosphere is ~300 PPM, or 0.03%(both factor out to be the same). I would guess that there is definately MORE CO2 in our atmosphere, considering that letting water sit, the CO2 will dissolve out to ~3 PPM(or 0.0003%). I don't think that they(water & air) will reach an equillibrium. I am hopeing that someone(happychem, possibly?) will know this, as I am now intrigued.
 
There is a lot more CO2 in our atmosphere than in our tanks. The most you want to have in your tank is about 30ppm whereas you breath about 300 ppm.
 
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