do premix and nothing else, otherwise if you add freshwater to the tank, then add salt it will stress the fish to the point of death due to the salinity change and the specific gravity change, also if the fish come on contact with high concentration of salt (for example lying down on a pile of undissolved salt) can harm them. Mix it in a bucket and either place an airstone with an air pump in there, stir it for 15 minutes or put a powerhead there, then test the specific gravity and add more salt or more freshwater to get it where you want
you can add freshwater, then add salt if you are setting up the tank with nothing in it, once you have live stuff in it (includes rock and sand) you need to pre-mix.
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