white tubes in the filter

[bettachris4]

There are white tubes in my filter and protien skimmer. They were first on my rock and now they are in the filter.
they arent sponges because they have filter feeding tenticles on the outside.
Small, white, not apsitisa.

 

[cowfishrule]

small filter feeder fan worms.
harmless.
they naturally occur just about everywhere.