Unless you're testing for strontium, do not add it to your tank. Do a large water change and add nothing. The corals don't need food, so cut out the Snow for a while.
Do not worry about chemistry (Iodide, strontium, etc). Any good quality salt will take care of that. For now, with that amount of coral, I wouldn't even worry about Ca or alk, again, water changes will keep them where they need to be. pH is a useless value, don't concern yourself with it.
Clean water, food for the fish, not too much flow hitting the corals and sufficient light will get you off to a much better start.
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Brad
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