What is it?

I agree that it looks most like a duncan, but possibly a blasto too though the base looks to be branching which would lead me back to a duncan.
 
Interesting coral, never owned one. Are they like anemones in the sense that they will sting other corals that they walk near?
 
Mine walks next to zoas, montis and rics. I have not noticed any warfare. I have heard that they can sting. Guessing each is different, or maybe it matters what coral they come near.
 
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