Just found these guys

[paul01]

Was wondering if you can tell me what they are and if good or bad

 

[Big G]

Ninja Star snails. Awesome cleaners. Cool

 

[Soflow Rubio's Corals]

They are good but some claim they eat zoas.

 

[reef lover]

I thought they were in the astrea family? Never heard of them eating ZOA's...

 

[DSC reef]

I've never heard of any astrea species eating zoas. They will eat the algae around zoas but not the coral themselves. To the OP, these are a good member of the clean up crew.