Anyone willing to help me ID this starfish?

Got a new piece of live rock yesterday and guess who jumped off but 2 of these guy!

I just wonder if they are a pest starfish, or if I would rather have them?
Total size is about 1.5 inches from tip to tip

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Yes sir, brittle starfish and they're good to have. If you saw those you have many more. They're a very good member of your CUC.
 
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