Ignore the balance part of the calculator. It's just wrong and misleading. I'd correct the magnesium, in 5 doses over 5 days, no more than 100 ppm per day. I'd try correcting the calcium and alkalinity, to reduce any possible stress on the animals, but that might not work. Won't hurt to try, though, if you're using calcium chloride and baking soda.
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Jonathan Bertoni
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