An option for you would be to switch to regular IO and add some muriatic acid to it to bring down the KH (best to let it mix overnight after to let the pH come back up). IO has low Ca and Mg, so those numbers would slowly fall, then once they do you can add Ca and Mg to the freshly mixed IO to target specific numbers.
OR...switch to a salt that matches your desired parameters right out of the bucket. H2Ocean is very close to your ideal parameters you listed.
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~ Mindy
SPS fanatic.
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