Feather Duster??

[inspire0522]

Wondering if anyone could help me out... I have a 10p Fiji LR that seems to be growing feather dusters?? Its been in the tank for about 6months now and is the only rock i have. There very very small white with red "feathers".. Looks like maybe 50 or so that i can see.. when i tap the glass they retract... are they feathers or maybe something else? sorry i don't have a pic..

 

[sompa]

tube worms...yes mini feather dusters they won't get as big as the bought dusters like hawiian dusters.