feather dusters spreading!

[OARrocks]

a couple of my live rocks came with feather dusters, ranging from 1 inch purple ones to the standard white ones. got the rock about 3 months ago and now i have feather dusters popping up in my sandbed.
are they reproducing or do they move?

 

[alan214]

Probably reproducing but you should not be worried. They are beneficial to your tank.

 

[rustybucket145]

yup beneficial, and a testament to the nutrients in your tank.

 

[Pico Keeper]

They won't grow out of control in a nutrient void tank.

 

[vanmo92]

here is not a 2 cm square area in my tank that dosnt have one (or 15) of those on it). I kinda like em'.

 

[vanmo92]

There*

 

[splateee]

Nothing wrong with feather dusters. I have them growing in my CPR bakpaks