Yep, your decision. Personally, I asked my LFS if they would give me some. I definitely got a strange look. ;Joyful I divided them up between my pico tanks and haven't had any serious problems. They've figured out that corals get food. Oh. Joy. So they will climb the coral to steal food. So I squirt food on the sand for them to get and leave the corals alone. And, of course, ya gotta give the hermits their share too.

My asterinas will eat struggling/dying zoas. I haven't seen them hurt anything healthy. I enjoy watching them do their starfish thing. They move surprisingly fast for their build. And they also take strange forms after dividing. I have one with 7 legs, with 4 straight in a row. ;Wideyed It was also very interesting to watch one leg with barely a mouth get itself around and eventually getting little leg nubbins!
I hope my experiences with them help you out. I've yet to hit plague proportions, but there is a shrimp for that!