adjusting parameters of salt water change

I dose calcium and magnesium up to 400 ppm and 1250 ppm before doing a water change, because I use Instant Ocean, and its levels are rather low. So it depends on the salt product you're using, and the target levels for your tank.
 
Let me rephrase that. Do you adjust the new salt water change to match what should be in your tank?
Thanks,
Doug
 
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