To expand a bit on what he said:
From what I have read you want the PH inside your reactor to sit between 6.5 and 6.7 in order to dissolve your media. Below 6.5 is too fast and turns the media to mush? above 6.7 and you aren't doing much. So you have two ways to control what your ph is, CO2 bubble rate(gas amount) and effluent rate. High gas rate plus high effluent rate equals more alk and calcium. Low gas rate and low effluent rate equals less alk etc. It is about hitting your PH target while finding the demand of your tank. So you adjust either in whatever combination to get where you want to be.
Because I have a low demands at the moment my gas shuts off in the evening for several hours also. On my setup the gas release amount will only go so low, luckily I have an electronic regulator so it can be controlled by a timer.
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