Yellow flower/feather like hitchhiker coral id

[jhrowlands]

Been meaning to ask for a while. This yellowish feather/flower looking coral next to the yellow coral goby appeared in my tank on its own. Any idea what it is? I’ve been allowing it to grow. Safe to stay or remove? Not the Yellow Sea whip in the top right corner; coral in the middle of the picture.

Thanks everyone!

 

[bradleym]

Does it have a slightly purple base? If so I'd say it could be green star polyps.

 

[kjkszpj9]

Okinawa goby approves the SPS 10/10