He says he does in some cases.
I think it's not a bad idea to add circulation, which adds more O2, but why not add pure O2 to the tank at night instead like the CO2?

The air stone is cheap, but it does not add nearly as much as more flow from filters/powerheads etc, and adding pure O2 would really amplify bacteria and fish health if set properly.

I use O2 on a couple of tanks as a back up for high CO2.
Works very well.

But I like parmonious systems, adding another item that's not really needed is an issue for me.

I've never found a need nor real benefit for this.
Think about it, why even bother adding aeration at night?
Why not simply raise the spray bar or filter outflow for good current?
Then add a bit more CO2 to off set the CO2 out gassing during the day?

That makes a lot more sense.

If you have a sump, feeding it into the intake is not a big issue really, say 1 bubble a second for a 125 gal tank at night etc.
That way you do not blown out any O2 from the plants and get better water clarity as well.

Regards,
Tom Barr



Regards
Tom Barr