starfish?

[rt67ghy]

I found this hitchhiker. It's very small (2-3 mm). I took the image with a macro lens. Good or bad?

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[CarrieB]

Asterina starfish.

Mixed opinions on safety.


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[rt67ghy]

Thank you. I flushed it.

 

[ThRoewer]

These guys are primarily harmful to coralline algae. Generally they eat film algae, not coral.

If there was one then there are likely more. These guys can replicate rather fast by shedding arms which then grow the missing parts to become a complete sea star.

If they get out of hand you can control them with a harlequin shrimp.