Friend or foe starfish

[VB313]

 

[EmdeReef]

Asterina, usually fine. Some report issues, I’ve never had any.

 

[BadFish619]

+1 asterina. They eat coraline algae so you'll end up with a bunch of white spots on your rocks. They multiply quickly. There are probably dozens in your tank

 

[Katrina71]

I let mine graze and thin out the coralline, then I thin them out.