Hi Jason,
If you're going to add controller, control the input of the kalkwasser which would swing your pH faster than CO2 ever could. Open top tank and big skimmer will drive the CO2 out fairly quickly.
So I wouldn't worry about controlling the CA reactor, it's better leave it set to constant pH.
But if you're planning to dose kalk with peristaltic pump, then skip the controller all together.
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Denis
150g SPS reef;3x250WHQI,Tunze Streams,Wavebox,Neptune Apex,fishroom in basement  ,reefing since 93,SPS since 99.
TOTM June 2010
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