" wrote in message
om...
"Paul" wrote in message
...
Checking the CO2 in mid afternoon I find that pH is 7.6 and KH is 10dkh
=
7.5 ppm CO2, in the morning after lights on for a couple hours it
checks, pH
7.0, KH 9dkh, CO2 = 27 ppm. Is this depletion good, bad or indifferent.
Should I be looking at decreasing my surface agitation of the power
filter?
Thanks.

How are you adding the CO2?
I think if you supply enough current in the water column, have the out
flow from the CO2 reactor/diffuser shoot downward inot the plants,
that should help things.
You may need more flow in/out of the CO2 reactor.

The plants are using it up faster than the CO2 system you presently
have set can supply it , hence the loss near the end of the day and
when the plants are not using it at night, the levels slowly builds
back up to 27ppm etc.
Regards,
Tom Barr

I use a pressurized system. What would be a good reading for the morning?
Maybe I should up the bubble rate?