What's this start and is it bad?

[Piercy87]

I was doing a water change and a bit of aqua scraping the other day and found this star that I had never purchased so has come in on live rock. I think it's a brittle star of some kind and don't think that it is bad but would like a second opinion please.



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[54seaweed]

looks like a serpent star they are safe
I have around 8 big ones in my tank there fun to watch