ID on Jelly, Anemone or worm

[tic tac]

Hi all,
I'm new to this form but seems a good one.
I need something I D to know whether it's ok or not. it is increasing in numbers and does seem to be aggrevating my hard coral frags. i'll post a couple of bad pic's as I had to take them at night, as they only come out then,and the flash isn't very good. At a quick look it's a bit like a single thread spagette worm. but then the thread has fine short side shoots. It reaches about 7cm long and including the side frills about 3mm wide. seems to prefer the coral sand. It retracts to a short bit of jelly. As it waves about at night I'm not sure if it is just a filter feeder or can even pack a sting.Hope you can see them on the sand in the pic's. Was thinking about adding a copper band to see if he'll eat them.

[tdwyatt]

This is probably some type of sipionid or related tube worm, almost always harmess detrital feeders in the aquarium, but to truly be qble to ID the worm, we'll need a much more detailed photograph of the creature in uestion, possibly some microscopic shots of th head, mouthpieces, setae, antenna, periosteum, and body in general. I have included a key based on morphology of the creatures for your use in identifying the worm in question.

http://rmbr.nus.edu.sg/polychaete/frame.html