Not sure what this is. ID please

This is on a piece of rubble some zoas are on

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Are you talking about the anemone? ... the green and purple thing? Looks like what some call a Nickel Nem ??? maybe Majano ??? Not sure what color a majano is.
 
Majano is my best guess as well. Is it greenish under white lights? They really are quite pretty, but VERY invasive once they start splitting.
 
Looks like a baby plate. Let it grow a little more then you can break it off and another one will likely grow in its place.
 
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