Unless you believe the star polyps are infected with something you don't want to put into your tank, there is no need to do a dip. If you want to be sure, use a dip designed for corals instead of using freshwater.
As far as I know there are no predators of star polyps that would just come in on a rock that a dip would get rid of. I would not dip the rock at all if I were you.
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