Spiny Tentacle ID

[kimbroe1981]

Trying to ID these spiny tentacles. It looks like they are coming out of the tube part of my green star polyp. I haven't added anything to my tank recently. I do (or did) have a brittle star which I haven't seen in awhile. But these tentacles have been in the same spot for a couple of weeks now. They do move around and retract and reach.

 

[WalkerLovesTheOcean]

Looks like a common bristle worm.

 

[kimbroe1981]

Looks like a common bristle worm.

Do you know if they're bad?

 

[WalkerLovesTheOcean]

Do you know if they're bad?

They're a harmless detritivore. Just don't touch them

 

[clarity]

They look like bristle worms to me— but if they never come out (say, during feeding) it’s entirely possible that they are brittle star legs! It’s pretty common for live rock to get a variety of brittle star hitchhikers.