Just added a couple Maximas to the tank and will be watching Alk/Ca/Mg, but wondering how high approaches a danger zone. My Alk has been as high as 12.3 dKH, Ca about 450-ish this past week until I stopped the CO2 to the reactor and let it settle back to high 10's for the moment. My plan is to use my Trident to cycle the Co2 on and off to maintain a reasonably stable range. Many recommendations of only 8 dKH seem low to me for an SPS dominated tank. Opinions on what to shoot for?