I agree with Brad as to the keep it simple approach, but I would do weekly tests for Calcium, Alkalinity and Magnesium. Even if your tests for those three are fine, it will help you understand how your corals react to different water conditions and give you peace of mind that there's nothing seriously wrong.
Don't worry about the iodide, stop dosing the strontium and Reef Snow.
Do weekly water changes, 10%
Large fleshy corals will frequently expand and contract. It is their way of processing waste products. Think of a sponge wringing itself out.
It can also be from poor water conditions, but your weekly water tests will tell you something is wrong.
Please tell us what salt your are using, the lighting you have and what the temperature number is.
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Mitch
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