I have been using Oceanic for over a year now. It mixes very easy and completely, and the calcium levels are great. My alk levels are abysmal though. I am thinking of adding a teaspoon of baking soda a day to offset this, or mixing the salt with another brand. The baking soda sounds easiest, but I'm nervous about it because I haven't done it before. I have coraline everywhere, so for those with no coraline, Oceanic may be the way to go. :fish2: