ID please are these pest?

[Saltar]

Are these flatworms or another pest? I have 4-5 that I can see.

 

[Mike J.]

Asterina Sea Star. Depends who you ask is they're pests or not.

 

[Tahoe61]

Hundreds of different types of Asterina, some are corals eaters, some coralline eaters, some algae eaters and some can be invasive secondary to population growth. Color sometimes helps to nail down type but that is still hit and miss. I find them an interesting addition to a tank as long as their numbers stay small and they stay away from corals.

 

[glb]

I remove them when I see them just in case.

 

[Joeysreef]

get a harlequin shrimp he will fix your problem