My PH was 7.9 all the time ... since adding the CA reactor my PH is now 8.2 - 8.3 day and night ... my coral has never looked better its growing like crazy and I don't have to add alk/ca every day ... and the best part .. is my alk and ca are stable at 10.7 and 420 ....
I would recommend anyone with a SPS dominate tank they run a CA reactor ... its makes life so much easier!