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Re: Aquatic Plants Digest V3 #958

> CO2 concentration in the air is already nominally 350 ppm, far above what
> our tanks have. And "trapping" implies no rapid (in terms of how fast we
> inject) diffusion. And assuming there are *absolutely* no air currents
> above the tank to disturb the air.

The CO2 concentration in air is not the same as the CO2 concentration in water.
Raising the concentration in the water will cause more to go into the air until a
new equilibrium is established. The reverse is true, raising or lowering the
concentration in the air above the water will cause the concentration in the water
to move proportionately in the same direction. As far as diffusion is concerned,
if a tank top were sealed well enough to prevent CO2 diffusion into the room, the
tank would probably have a severe problem with oxygen not getting in when needed.

Harvey Schneider
<harvsch at earthlink_net>