Hitchhiker ID - worm?

[cosorio]

I recently purchased some LR from a local reefer and just noticed a couple of days ago that it came with a hitchhiker. I haven't seen the entire body, but the part I saw was about 3 inches long and about 1/4 inch wide. It's white with 2 rows of spines in its back. I can't take a pic because whenever I turn on the lights, this thing will hide within the rocks. A good comparison would be a white caterpillar. Anybody have experience with these and if so, are they harmful to fish and corals? Thanks.

 

[LeslieH]

Sorry, that's not enough info to say anything but polychaete worm. The worm should stay out if you use a flashlight with transparent red plastic taped over the end to examine your tank at night and then you can take a picture.

 

[cosorio]

I just called the reefer I bought the LR from, and he confirmed that it is a brittle star.

 

[LeslieH]

:lol: