In article .net,
Gfishery wrote:

Maybe I'm missing something here.
We don't want dissolved gases/air in our new water for the fish tank, but we
want aeration in the fish tank (for more air in the fish tank water)??

I missed that part of the thread, but...


The following is probably not a good idea, but if I wanted more O2 in the
water, why not add some Hydrogen Peroxide to the water?

You don't want to drink it, and neither do your fish. Not recommended.

If I wanted more CO2 in the water, why not add a small cube of dry-ice to
the water?

Creates local cold spots, probably would overdose it (as there is a LOT
of CO2 in even a small block of dry ice) There are other ways to
increase CO2/carbonate if you need it - isn't the CO2 mostly for if you
have live plants?