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CO2 and anabantoids

I wonder if anyone has been using CO2 injection in tanks with 
anabantoids (labyrinth fishes such as bettas). As some CO2 dissipated 
out of the water,  the anabantoids may be unable to breeth. CO2 is 
heavier than O2, and hence it may accumulate on the water surface, 
especially with a tight top cover. 

I've been thinking about reintroducing DIY CO2 in my tanks, but since 
I keep anabantoids, I'm not quite sure whether it is safe.