Just juice it! I think you for Liverocks right? If so it isn't supposed to be an aiptasia but some type of rock anemone from the gulf. They aren't supposed to spead as fast as normal aips. Personally I'd juice it! As for your "lobster" post The only think that has a lobsterlike tail is a mantis shrimp! And there are plenty on aquacultured rock! Do a quick site search on Mantis Shrimp.
I wish I had a nickel for every miracle that you easily tricked me into. -Chris Robinson