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Re: [APD] CO2 rates, CF & pH swings

KB: "I recently upgraded the lighting in my 50g tank from around 130w to 6 
x 55w CF's (= 330w)."


KB: "Is that because with the increased light, the plants are using the CO2 
faster than it's being provided when the lights are on?"

Sounds plausible.

KB: "I've scanned the archives & opinion (in the few posts that cover this 
topic) seems divided?"

Differences of opinion!? Here!?!?

KB: "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."

Since you already have the equipment, that sounds like a good plan. The 
other way to do it is to create enough circulation in the water so that the 
tank is blowing off CO2 at a constant rate, night or day. Provide enough 
CO2 that the fish don't stress, especially at night. Then, the fish are 
safe and the plants dip into the reserve during the day. It won't be 
absolutely optimal for the plants, but works at a simple foolproof 
mechanical level for the fish.


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