I've tried a lot of different salts. Usually I get live aquaria salt but they were out and I tried the fritz blue. Mixed per instructions and the parameters were off. Alk was fine at 8.5 but cal was 350, mag was 1310ish. The salt was mixed and shaken well before using so I just dosed the w/c water to make up for it. I had always heard that fritz/live aquaria were the same salt so that's why I used it. I forget where the thread is but this has turned out to be false, each independently make their own salt apparently. Anyways, back to live aquaria now that it's back in stock. I've tried IO regular and RC but the alk is just too high for my taste..I like about 8-8.3. And no there is no scientific reasoning behind it..lol...it just works for me.