I've got two in my tank with 2 tangs a reef lobster 2 clowns and a couple other inverts.. I was worried at first as well especially with the lobster but he hasn't shown any interest at all since I put them in and that was about 5-6 months ago maybe longer. they did go through my asterina population pretty quickly and I had A LOT!! so they get fed CC stars every 2-3 weeks now
they do eat a surprising amount. i've had mine for almost two years now. she goes through a CCS about once a week. she's big now.
+1 on thisI drop in the whole star. I don't have another tank to keep the stars in at the moment. I've also not been able to get enough stars at on time to try just harvesting arms.
I tried keeping them in the sump, but you need to make sure they can't get in to pump intakes. My skimmer and return pump were open inlet and the stars kept jamming their arms in to the inlets and getting shredded.