Worm!?!?!?

[Ree]

please help I found this worm in my sand don't know if there are more within my tank
Is it harmful what do I do?? It's currently 2.5 inches long thin and black
(Tried to post pic but couldn't )

 

[NanaReefer]

Sorry, without a pic it's hard to I.D. Try here for visual comparison. Choose, info links, hitch hikers, worms.
http://www.chucksaddiction.com

 

[maxxin69]

[FONT=Open Sans, tahoma, helvetica, arial, sans-serif] It might be a Notospermus ribbon worm. If so they will prey on small crustaceans and worms. It apparently won't harm fish or corals. Also take it out with tweezers since they do have a venom, although I don't know the toxicity. [/FONT]

 

[Ree]

Pic