[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[APD] CO2 rates, CF & pH swings
I recently upgraded the lighting in my 50g tank from around 130w to 6 x
55w CF's (= 330w).
I have a CO2 system with pH controller but, with my previously lower
lighting levels, I ultimately disconnected the solenoid valve & just ran
the CO2 "open-loop" at a nominal rate.
This was fine to keep the plants "ticking over".
Now though, with the new lights, I find that, during the night (lights
off) the pH falls to around 6.9. But within 3 - 4 hours of the lights
coming on the pH rises to around 7.5 (the current pH of a sample of tank
water separately aerated overnight is 7.6).
Is that because with the increased light, the plants are using the CO2
faster than it's being provided when the lights are on?
I've scanned the archives & opinion (in the few posts that cover this
topic) seems divided?
I'm interested to know because I'm considering putting my pH controller &
solenoid valve back into operation & increasing the baseline flow rate so
that, when the pH starts to rise, the CO2 injection rate can be much
higher than I would dare to run continuously.
Aquatic-Plants mailing list
Aquatic-Plants at actwin_com