tiny feather dusters?

[sharper]

I found about 4 very tiny feather dusters on my live rock today.
Will they get any bigger to be a great size, or is that a different tube worm all together?
Hope they will grow, one of them is purple, the other 3 are white.

I could take a pic, but it may be too small to show up.

 

[Jeffrey Porter]

are the white ones really small. if they are they will not get any bigger. but in a few months you may have hundreds. they cover everything in the dark in my tank and are even growing out in the light.

 

[sharper]

Should I be concerned about them, or can I let them be?

I hope the purple one gets bigger. Its purple with white speckles and it's about twice the size of the smaller white ones.

 

[Ryanqk]

In my experience there is nothing to fear from large colonies of fan worms they help filter stuff out of the water. I encourage the growth of mine, i have 4 types and probably 30-35 individual fanworms that i can guestimate.
Ryan