Parasitic featherdusters?

[CuzzA]

A Google search using the terms "tangled tube worms" produced some similar images. Perhaps that's a start to finding a proper ID.

 

[karimwassef]

<a href="http://s1062.photobucket.com/user/karimwassef/media/877BF727-3F8D-44C0-B22D-114534742130_zps7ycgzpaq.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/877BF727-3F8D-44C0-B22D-114534742130_zps7ycgzpaq.jpg" border="0" alt=" photo 877BF727-3F8D-44C0-B22D-114534742130_zps7ycgzpaq.jpg"/></a>

They're encroaching the polyps. At least for these LPS polyps, they're killing my coral.

 

[karimwassef]

One polyp has died already... these are definitely parasitic

<iframe width="560" height="315" src="https://www.youtube.com/embed/PDvSZvevf_Q" frameborder="0" allowfullscreen></iframe>

The idea that all featherdusters are good... I think this disproves it