Are these coco worms or something else?

[Onixom]

Hello, so awhile ago i bought some corals and this guy was on the side of one (not sure if the red carpet part is a coral but as this guy was attached to the left i thought id keep it in the tank)

Please excuse the state of the tank its new.
Then today i bought some nassarius snails and then noticed this guy (thinking its to do with the snails but not sure and its the best photo i can get as i dont know if ill see it again

Any help will be appreciated. Thanks in advance

 

[monkeyCmonkeyDo]

Yes feather dusters
D