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Can a calcium spike kill corals
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Depends on what you mean, but I don't think any reasonable boost to calcium is a concern. Like a 100 ppm boost should not be an issue.
A more important reason to limit calcium and magnesium additions is to limit the impurities that can come in with them. Heavy metals, ammonia, etc.
I'd limit them to 25 ppm per day for that reason.
By adding what?
Assuming you didn't add an equal amount of the alkalinity part, it should be OK.