Very interested to see what becomes of this. I've personally been using Red Sea Coral Pro for about the last 8 months. My only complaint is the same, sort of lower than ideal ph at 8 exact all the time, and a kh that I cannot get above 8 without drastic waterchanges (usually 7 kh). On a 75+25 with alot of sand and LR I usually do about 10-15 gallons a week, recently changed from phosguard to GFO (4 days ago), and running a coralife 125 skimmer. Have been wondering if its just the salt mix, after reading in other forums peoples same complaints. I have kalk but I havent dosed it yet despite being able to test for safe params.