Joe was an importer way back in the early 2000's. He turned out to be a crook, but until he sold some that carried cryptobia he had some very nice fish for sale. His mix contained magnesium sulfate, calcium sulfate, and something else I can't remember. I don't remember the proportions either. As it turned out, he wasn't the one who came up with this recipe. He got it from a book written by someone somewhere in Asia.
Sorry I don't remember more. It was a long time ago.