Is your star a "serpant" or is it a green brittle star? This sounds lke the behaviour of a green brittle. I've had them arch their legs and drop over unsuspecting fish. If it isn't a green brittle than i would say that you are pretty safe. I personaly don't know of any other starfish of that general shape(brittle/serpant) that would attack fish. HTH
[ July 22, 2001: Message edited by: fishfreek ]