I got some live rock today and a few hours later I noticed this little bugger on the front of my tank. I've done a little research and think it may be an asterina star. I'm just wondering if 1) is it an asternia? and 2) if so, should I keep it or just get rid of it
http://imgur.com/7ChV4.jpg
http://imgur.com/tHYMf.jpg
http://imgur.com/7ChV4.jpg
http://imgur.com/tHYMf.jpg