No idea what that polyp coral is. Can you get some more photos of it? More close ups and a brief description of it's location in the tank, etc.
I am not 100% sure it is bryopsis... but I'm looking on my phone and probably missing details. Check some comparisons with different types of feather caulerpa, and see if anything eats it before committing to a full on war against bryopsis. Pruning is good, but make sure not to let fragments loose that could spread if it is an evasive algae like bryopsis. Anything you can remove, dip with H2O2. If you do a search on MAAST you will find several threads on the subject
Go ahead a bookmark this link. It will come in hand time and time again.
www.chucksaddiction.com/hitchhikers.html
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