The question was, "is it possible to have too much air in the tank?"
The correct answer is "yes."
Too much can kill fish, create ph issues and harm plants.
From:
http://www.thekrib.com/Plants/kelly-intro.html
How to Grow Beautiful Aquarium Plants on a Student Budget
AIR PUMPS/BUBBLERS
Don't use them. Any fresh air contacting the water will deplete the CO2 dissolved in the water to very low levels. The plants produce enough oxygen to last all night even for most tightly sealed aquaria. However, if your fish are gasping at the surface in the morning (I've never seen this) then turn on an airstone ONLY AT NIGHT when the plants don't use CO2.
That is both poppycock and nonsense. Air stones do not always drive out CO2 unless there is higher CO2 content in the water than in the air. The water surface is like a permeable membrane and molecules change across it to achieve equilibrium. So for instance, if the CO2 content in the water is higher than in the air the CO2 molecules will go across the membrane into the air in order to equalize the number of molecules on each side. Just like if there is more CO2 in the air above the water the CO2 molecules will then move into the water. Air pumps do not oxygenate the water they create surface disturbance, which acts as at catalyst increasing the amount of diffusion of molecules. This is why you don't want a lot of surface disturbance in a tank with injected CO2. This link should give you a little more insight on the general process. This wasn't some crap found on the web that happens to be one man's opinion, it is science. http://www.s-cool.co.uk/topic_quick...d=4&subject_id=3&ebt=57&ebn=&ebs=&ebl=&elc=13
If that was the case what about good 'ol mother nature? What happens out in the real world where air just goes about freely doing whatever it pleases? Are you going to tell me now that the fish in nature are diving because of Ph swings and whatnot? What about salmon swimming upstream? That water is pretty turbulent with a lot of fast current and bubbles. They're not dead.
Once the molecules reach equilibrium they stop diffusing, unless you know something I don't.
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