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That's definitely not a Duncan. Keep an eye on it to see if it moves from that spot. If so, it's definitely an anemone and you will have to decide if they are comparable with what you want to do with your tank.
Definitely looks like rock anemone. Great nems to have real easy and hardy and if you want more real easy to frag by slicing them down the middle with a real sharp knife
Not a majano...though it is easy to see how one could see it as one. A more difficult ID since it isn't one of the really colorful varieties that people spend big bucks on.
Touch it with something to see if it go back into the rock. Looks like a anemone and I don't think it is a good one to have since you already have 4 in a small area. it is most likely a fast growing pest anemone.