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Is it possible for their to be too much aeration where it suffocates the fish or causes irritation? Thanks.

Chris

If there is so much aeration that there is a fog of tiny air bubbles in the tank, yes, it can burn gills and cause irritation. You've got to have some insane, crazy fine bubbles tho.

In normal circumstances no. I'm sure it's possible but you'd have to just fill the tank with bubble wands and such. You'd have trouble seeing the fish through all the bubbles so even if you love bubbles it's not likely you'd add that much to your tank.

I think if you manage to oversaturate the water with gas you can end up with gas bubble disease, but I'm unsure of thats oxygen specifically or just air.

For animals, the entire universe has been neatly divided into things to (a) mate with, (b) eat, (c) run away from, and (d) rocks. - Terry Pratchett

Fish don't really breath gas bubbles in the water.
It's the dissolved oxygen in the water that gets used.
And the amount of dissolved oxygen in fresh water with specific temperature etc is constant.
So you will get to a point where you can't dissolved more oxygen into the water and excess will get exchanged at the surface.

Also, the bubble is not purely oxygen, it has other gasses in it.
So eventually you will have an equilibrium of different gass concentration in the water.

But it's kind of dangerous if the fish inhales a bubbled gas. As oxygen or any gas exchanges more readily in the gaseous form then dissolved form.