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I've been using Reef Crystals since I've started my tank. Its by the same company that makes IO so I'll have to keep an eye on the levels with my next bag... which will be soon...
I'm using Coral LIfe REd Sea right now. They say that as long as it is "naturally balanced" and not "purely balanced" than you should be doing good. If you ask who "they" are, I would tell you that its the people who sell it, so take that with a grain of......well.......salt.