6 legged starfish

[otisbooard]

just found this 6 legged starfish in the tank

 

[EeyoreIsMySpiritAnimal]

https://www.reef2reef.com/threads/what-is-that-a-r2r-guide-to-common-new-tank-hitchhikers.443382/

 

[exnisstech]

I see that often in astrina stars

 

[ISpeakForTheSeas]

Aquilonastra starfish (known in the hobby as "Asterina") - some species are fine/helpful, others have been known (at least when in large numbers) to go after corals (almost always zoas).

As a general rule, if the top of the starfish is primarily black, or if it has red/orangish spots on it (like the star in the link below), then it may be harmful:
https://www.reef2reef.com/threads/e...g-some-zoanthids.1062019/page-3#post-12665293