setting up a CAL reactor

[Delphinus]

To be honest Mike I think you should leave it set where you have it, and if you need to adjust Ca over Alk, try some two-parters like Seachem Reef Advantage and Reef Calcium as needed. The trick with reactors is that they're better at maintaining levels than they are at adjusting levels. Not that you can't do it, but I've found by messing around with the reactors it's easy to overdose CO2 and then you end up with things like valonia bubble algae over EVERYTHING.

I generally aim for 30 ml/min with whatever bubble rate required to maintain an effluent pH of 6.7. (e.g. if the pH is too high I raise the bubble rate, if the pH is too low I slow the bubble rate). If after a week the Alk level in the tank haven't maintained constant then I increase the flowrate and adjust the bubble rate again to maintain 6.7 at the higher flowrate. I don't think I've ever run a reactor faster than 60ml/min.