Unknown alge

[PinCave]

Could someone help me ID this alge?
Found them on live rock, less than a penny size.
Should I remove them?

I'm new to this hobby.

 

[PinCave]

Just come across this picture
http://www.liveaquaria.com/product/prod_Display.cfm?pCatId=2046

Would this be a starting of a Zoanthus Colony polyp?

 

[kbecker]

It is a feather duster

 

[bluenassarius]

yup feather duster LOL