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This is a shot in the dark, but it sounds more like you had an oxygen/CO2 problem. I don't think too much calcium could kill fish or inverts, but too much CO2 certainly could. Was your nitrate/phosphate level that high before the kalk addition? And why add so much at once?
Or, perhaps a toxin was released?
Either way, I wouldn't hold off on the water changes--I'd change out as much water as I could make, and continue with water changes over the next days to get your levels back to normal.
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