Strange worm in tank - Good or Bad?

[jacksonimaging]

There is some sort of worm in my 37 gallon. It is in a small hole in one of the pieces of live rock. When it gets startled it pulls back into the rock. It is dark brown with some lighter brown banding. It can stretch out about 4-5 inches and is less than 1/16 of an inch around. It doesn't seam to have any appendages (like a feather duster). It looks like a scavenger, it browses through the rock around it looking for things to eat. It will pick up debris then drop it. Its on the underside (roof) of a cave at the bottom of my tank. Is this a good or bad invert? If its bad can I pull it out? It just sucks back into the rock. Any help is greatly appreciated Thanks!

http://reefcentral.com/gallery/data/563/170627IMG_4650_1.jpg

http://reefcentral.com/gallery/data/563/170627IMG_4651_1.jpg

 

[kar93]

the pics are too small to make it out. but it looks like a bristleworm but i cant be sure because the pics are too small.

Bristleworms wont really do much but eat leftover detrius. If you have any dead fish in the rocks you cant get to it will also eat that. So in a way they are a blessing

 

[jacksonimaging]

Don't bristle worms have "quills" all over them? This worm is smooth.

 

[ulthariansamba]

Looks like a peanut worm (sipunculan) to me. A harmless deposit feeder.

 

[jacksonimaging]

here is a bigger photo

 

[RokleM]

<a href=showthread.php?s=&postid=11294915#post11294915 target=_blank>Originally posted</a> by ulthariansamba
Looks like a peanut worm (sipunculan) to me. A harmless deposit feeder.

I agree.

 

[invertaman]

yep, its a peanut. Harmless detrius feeders.