Is thisA Duncan?

[KLandry]

Is there a chance this is a Duncan polyp? It came on a shell that was on a piece of live rock now it’s growing out of the little snail shell hole when it closes. It closes down into the hole so I can’t see the base at all. It’s not much bigger than a Zoa but definitely looks like a Duncan.

 

[fishyjoes]

My non-expert attempt...
I would guess it's a majano anemone. I've never seen a duncan with those "bubble tip" looking tentacles

 

[crazyfishmom]

Unfortunately that’s a Majano anemone. Recommendation is to remove it. They can take over a tank pretty quickly.