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Re: CO2 system with/without pH controller

Just to chime in on the CO2-control question. We had our UltraLife
commercial system on with the lights for our 135-gal. 
Needed >2 bubbles /sec and the pH swing was about 0.4. 

Now, keeping it on 24 hours, the pH swing is < 0.2. The CO2
ranges from about 10-25 ppm. I guess the UltraLife
reactor is pretty efficient: it takes less than 1 bubble/sec. 
Works for me.