A comment on common names.....bristle worms and tube/feather worms are all polychaetes. The tube/feather worms belong to a group of polychaetes called sedentaria (as you will have guessed because they are sedentary and do not move around much) and the bristle worms belong to the group called "errantia" because they are mobile. Both have bristles - if you look at a tube/feather worm out of its tube you will see that they also have the bristles all along each side.
Of the common names I would suggest feather worm. iwould suggest that tube worm be used for those without obvious "feathers" on their heads or those which form tunnels in the sannad or mud.
The polycheate that you have there is a member of the family Sabellidae. To get to a genus and species I would need to know exactly where it came from and also have to look at the worm under a microscope as the distinguishing characteristics are things like the detail of the "feathers" and the collar at the base of the feathers. Colour is not really a distinguishing feature that can be relied on. However I would guess that the polycheate that you have pictures of belongs to the genus Banchiomma.