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Looks like a majano anemone to me. PPest anemone considered to be an aiptasia on steroids. Same methods of irradication, kalk injection, vinegar injection, lemon juice injection.
I had some majano anemones just like that in my nano a while back. I also had some aiptasia, so I bought two peppermint shrimp. They ate the aiptasia and the majano anemones like they were candy.
well i have to admit they are pretty derned cool looking but if your going to keep cprals they could sting the corals to death which is why folks like to get rid of em before they get out of hand.