According to some water tests done on various brands of salt mix the Calcium, Alkalinity and Magnesium of Reef Crystals is 490, 13, and 1440 respectively at a salinity of 1.026 which looks just fine to me.
http://reefcentral.com/forums/showth...readid=1287118
To those of you who said that this salt mix would have low levels and needed to be supplemented, what levels were your test kits reading? Has Reef Crystals recently changed their formula or do you target even higher levels than those?