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Looks like apstasia to me.It will take over if you do not get it out of your tank.A lot of people use Joe's juice I have pepper mint shrinp in my tanks and they work well for me.
that seems to me more like majano which peppermint usually won't consume those.however, they are not as bad as aiptasia.They will not populate as fast as aipasia.Mine was left alone in my main tank with 5 peppermint, and after 5 months it still there and didn't do any harm.If it does out of control maybe do a Kal injection and it should kill it.
try this link=) hope this helps http://www.wetwebmedia.com/ca/cav1i3/aiptasia_impressions/aiptaisia_impressions.htm
just an update, i think it's an orange tentacle zoo. i moved it into my fuge because my water flow (1500gph) is a bit high for it and within a few days had already split. i did get some pics of the actual splitting but they are a little blurry. with them in the fuge they really can't do much but i'm gonna try to get a bunch of them and give them to a friend. i'm still trying to find any other pictures of an orange tentacle zoo.
Here is a pic of my orange zoos. http://www.aquariumadvice.com/photopost/showphoto.php?photo=6659&cat=500&page=1
I'm not sure what your critter is but I don't think it's a zoanthid. Still looks like an anemone. Especially with that bright green foot. Kinda looks like an anemone I just picked up but can't ID. I've included a pic. I have two of these anemones and the colors vary.