Critter ID

[usmc2897]

Anyone know what kind of worm or critter this is? Moves fast and looks like it has a black head to it. It is somewhat new to my tank and im not sure where it came from but there are a ton of them. Pretty sure its not a flat worm and I have seen any bad reactions to it. All my corals look great so Im assuming this is a good guy. These are the best pics I could get of the worm like creature let me know if you have any idea what it is.

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http://i42.photobucket.com/albums/e...loads/2015-11/20151101_132636_zpshxbomsk3.mp4

 

[usmc2897]

Bump