Well, I wish I could do that. I have the reactor on 24/7 with a pH probe that monitors the reactor's internal pH. I keep that stable and have the CO2 turn off and on with the pH to keep it stable. If I was to have the reactor pump off below 8.0 then the reactor could possibly not be on for a period of time and therefore my Alk/Ca would fall. My tank has a very high demand so daily I lose about 3 dkh/20-30 ca.
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