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I think all of the bases have been covered here, but I'd like to piggy-back on what everyone else has said and add one more thing.
When you purchase a new batch of salt mixture, I would mix per the instructions, and then test that water before adding it to your tank (just test it once). This will give you a good idea of how doing water changes with that particular batch will affect your levels.
Different brands have different levels, and I have found that different salt batches from the same brand (and even same kind) of salt can vary here and there. For example, if you know that your mixture has a base Calc level of 340, it will probably take a bit more dosing to maintain the ideal 400-420 range than it did in your previous batch that tested at, say, 380.
Just to echo the rest of people in this thread: test test test, record record record. After several cycles, you won't even think twice about it.
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