ou i think you two hit it on the head, i found a pic of the exact same looking anemone on another site, and it's definately an Anemonia Anemone which is the manjo speicies or something. i dunno how it's classified, but yah, definately a manjo.
here's the link if anyone is interested, they have lots of pics of pretty anemones that are actually bad for your tank! not bad, but pests. not as bad as aptasia though! woohoo!
http://www.wetwebmedia.com/anemoniafaqs.htm