I'm not sure. Long sorry short i was looking at the build your own clean up crew on live aquaria checked a bunch of stuff that i might want talked to my wife about maybe buying but money is tight so i would wait left the page up and she bought everything i had checked. So now i have all this stuff coming tomorrow. It just says brittle sea star. Now the more I'm reading the sea stars may eat my fish??? I have 2 crews that are an inch maybe inch and a half. Do i need to worry about one of them eating my clowns or any other fish?