What are they? ID HELP please.

[Jedimstr34]

So this is really cool I think… lol. Tank is coming along great, everything thriving but over the last month and a half or so I noticed these white squiggly things on, we call it our favorite rock. Some kind of weird growth that has grown, multiplied and viola! I have these guys. Nothing I put in but cool as heck I think… look like feather dusters but too many although I did have one for awhile and it withered before I got my biodiversity up. ID help please. Very small, inch or so with small dusters out on the end

 

[Jedimstr34]

Tank overall. 110 gallon

 

[namfuak]

Tube Worms / Fan Worms / Feather Dusters - I'm not sure what the actual scientific name is. From what I've read in the past, they're not true feather dusters. That's as big as they'll get.

They're harmless filter feeders and I've always liked seeing them in my tank.

 

[Isopod80]

It's typical for smaller species to grow in colonies like that.