Starfish ID Please!

I bought a new to me system and this guy was in it. ( Two actually )
I'd love to keep them but have heard Green Brittle Starfish are bad news.
Anyone able to confirm what type of starfish this is and whether or not it is reef safe?
Thanks!

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That looks like a green serpent starfish. They have a reputation for hunting smaller and slow moving fish if not properly fed when larger, but many keep them with no issues. http://www.bluezooaquatics.com/productDetail.asp?did=2&cid=85&pid=1267
 
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