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C02 layer above water?

A recent question on this list sparked this one of my own:

It seems possible that since CO2 is heavier than air, in some cases excess
CO2 (i.e., those bubbles that don't dissolve) could collect in the air
space above the water level of the aquarium, inhibiting 02 exchange. 

I should think that this might be a possibility in systems with poorly
regulated CO2 (DIY?). Has anyone ever heard of this happening? 

Phil Plumbo
St. Paul, MN