Can anyone ID this worm???

[QtJenny19]

I have found two identical worms squirming around my live rock and digesting my substrate. Their tubes are beige in color and very transparent. I can also see some brown spots on the tube. It has the apperance of a feather duster...it uses its tentacles to pick up sand and places it inside its tube. What can of worm is this and is it safe to have in my tank? Any information is greatly appreciated.

 

[Rogger Castells]

QT, Those are Feather-mouth sea cucumbers, They are not common to get them as hitch-hickers so feel lucky! They are safe to keep in your aquarium hopefully it has been set up long enough to substain their feeding.

Good luck.....Rogger

 

[scubasteve247]

yeah, there great detrivores, ive heard them called medusa worms. there good for your tank, never seen one that small, i think there ugly when they get big,

 

[Ludwigia73]

I would have guessed peanut worm, but you may be right... also looks like a medusa.