I think your best bet is multiple water changes with a low calcium salt like regular IO. You can either do a few over the course of the week or do larger ones like 50% today, 50% tomorrow and then see where you're at and take it from there.
What do you have in your tank? If things aren't looking stressed out you may be able to ride out the high calc and let it go down "naturally". In other words, there may not necessarily be a need to panic. Yet :-)
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