DrBDC
Active member
IO at 1.026/53 mv has 380/1200/11 for ca/mag/alk. The reefcrystals are supp. to have more in the ca and mag from what I understood. I use Randy's homemade and give them a bump in the ca/mag levels so I've never bothered to purchase the Reef Crystals and tested it. That doesn't make sense unless your refractometer is way off or you run hyposalinity in comparison to NSW.