Identifying hitchhiker

[Pharmasea]

Hello, I'm new to reefing and just set up my first tank ~ 4 months ago. I've noticed an uninvited guest(s) peeking out from underneath my chalice that has grown in both size and number over the past few weeks and was hoping someone could identify them to see if it's benign or something I need to address. I managed to grab a small piece of whatever these are with tweezers and it feels like it has a hard body and appears segmented with an alternating black and white color, but I'm unable to pull the entire organism out.
I thought it may be bristleworms, but I've read they usually live in the substrate so I wanted to get some more informed opinions. Thank you for your help and I'm sorry for the picture quality-it's very difficult to zoom in and focus on something so small with a phone camera.

 

[samnaz]

Brittle star

 

[redfishbluefish]

Appears to be the arms of a mini brittle starfish.....a good thing.

 

[El_Guapo13]

Bristle worms can and will go into live rock as well. That said, can you try to get a clearer, and maybe more zoomed in, pic? Also, welcom to R2R!!

#reefsquad assemble!!!

 

[Eagle_Steve]

I agree, mini brittle star. Good guys. Nice addition to a tanks clean up crew.

 

[El_Guapo13]

Appears to be the arms of a mini brittle starfish.....a good thing.

Ooh...I didn't even notice the other arm so I didn't consider that. Good catch.

 

[GoldeneyeRet]

Brittle star

 

[Phildago]

mini brittle

 

[Pharmasea]

Awesome, thanks everyone! Will it live between the chalice and plug forever? I've been seeing the arms reach out for a month now- could its body be trapped by the skeleton or would they normally hide until growing larger?

 

[Auquanut]

Well, I guess I don't have to chime in except to say WELCOME TO R2R! Glad to have you with us.

 

[Retro Reefer]

Welcome to R2R! And yes 100% a Brittle

 

[Hemmdog]

Brittle star

 

[CasaReefer]

Hey Pharma....Welcome to R2R ... Great First Question.. Congrats You Have Mini Brittles.. Well Hope to see some more pics of your tank and build... You know when ya get a minute.. :)

 

[Idoc]

Welcome to R2R!! And congrats on your brittle star...minus one leg, lol. It'll grow back!!

 

[reef lover]

Welcome to r2r!