Do I need an airstone?

This is not true. Although "air" is mostly hydrogen, it does contain enough 02 to sustain life (obviously). Pure 02 is not that good for you, makes you dizzy, etc.

Raising bubbles and surface disturbance does in fact introduce oxygen into the water.

Not to go off the original subject, but yes. I agree==="Raising bubbles and surface disturbance does in fact introduce oxygen into the water".

But the air around us is mostly Nitrogen, not Hydrogen. Hydrogen is too light and explosive.

But no worrys, I still love ya.
 
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