The water is not saturated with CO2 or O2 for that matter.

Whether it's with plants, new tap etc.

I think what causes confsion is that folks think that ambiment air pressure levels, that is 100% of that, but the water can hold a lot more gas than that.

When super saturation is talked about, it is only relative to the partial pressure in air, it's not that it cannot hold more than 100% and suddenly forms bubbles and degases.

If you think about it, you would see the CO2 gas doing the same thing even though it's 10X that of air level saturation, while O2 is at best 1.5X more.

Either way, you can let the tap water sit for a bit, then add it to the tank in the morning. Then wait till the end of the night before the lights go off. By then, the gas is equilibrated.

If you compare the pearling then vs the day before, you'll see a large difference.

Regards,
Tom Barr