There are no reef safe CC Stars  Sorry... some may be "reef safer", but for the most part, they are destructive in either a) their eating habits or b) they are just plain ol' bulldozers.
Dick is right, sand critters will not make it over unless in a medusa or larval stage. You may want to get some live sand from another reefer if your bed in the first tank is not desireable. Other critters like pods, mysid etc. can make the journey.
Green Star Polyps are pretty darned hearty. You can put some rubble or something next to the existing colony and let them grow in it, to be moved later or you can literally scrape and peel some of the colony off to move to the other tank. The stuff peels like carpeting and is bullet proof.
Dave
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Experience in aquaria, 35 years. Experience in marine, 20+ years. Experience in Reef Keeping, 6 years. Always a newbie! | 
