What is this in my sump??

I have this white root looking stuff in my sump. I believe that they may be very small feather dusters but I am not sure. If this is what they are should I remove them or leave them alone. Any help would be appreciated.

 

tube worms...hard shelled, they do x fast and will grow everywhere! in pumps included just dont let it get out of hand and you be good..there good to have.

by everywhere i meant everywhere were the worms are growing at in the tank (in that section of the filter/tank)

 

Are they good or bad???

 

there fine. just clean ur pumps (if n e are in the same area as the worms) they only seem to grow in a certain spot are rarely migrate from there..mine grow in the skimmer and sump style filter (rsm 130, stock filter). they seems to grow in the darker areas only/filter
IME

 

Thanks. They do only seem to grow in the areas of my sump that do not get very much light. They do not seem to be harming anything so I guess that I will let them be and just keep my pumps clean.