anemone that looks like aipasia (sp)

[TomRep]

I have this anemone in my tank and it really looks like Aiptasia. However, it's been in my system for about 2 years now (noticably, rock has been with me for 4 years) and has never spread. Are there other anemones that look like aiptasia? It is real tough to get a good view of it, but I attached a pic anyway. Thanks!
Tom

 

[Phyllia131]

Im pretty sure its an aptaisia. I'm not saying there arnt any other species that look similar, but they dont always spread. Only when you don't want them to.