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Water changes will never kill anything so long as the salt mix is done to the correct salinity/sg. I suggest starting a log and running the basic battery of tests to get a starting point. For reference there is a salt mix guide which outlines basic parameters (Alk, Cal, & Mag) for the various brands.
As for Alk now, don't supplement any until you have a satisfactory test result(s) you are confident in.
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90g Mixed Reef
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