Hi Dave,
I use aeration during the night.
I just started using a pressurized CO2 system one week ago which is already
proving itself!
The ph is steady at 6.8 and I also think it is very important to keep the
tank aerated when light are off in order to prevent big PH drops when plants
also eject CO2. It is also a factor depending on your fish stock and
size....
HTH
"Dave M. Picklyk" wrote in message
news:TI8kb.118953$6C4.48157@pd7tw1no...
I just thought I'd toss this around the newsgroup and see what kind of
opinions I get: What does everyone think about adding more aeration at
night
when the lights are off and plants have reversed their gas roles. I have
seen a few of my fish dwelling towards the water surface at night. I was
thinking about the possibility of adding a timed airstone for dark
periods.
I am concerned about fluctuating PH, but more about oxygenation for my
larger bodied fish.

Thanx for any help you can give!

Dave.

www.picklyk.com/aquascape