What is this thing?

[rm86100]

I have these things growing on my LR. these things hide when make a sudden movement near them or change in lighting.

You can barely see them in the pic. They are like little white tree looking things.

As always thanks for your help.

[MichaelsLilGray]

looks like your every day feather duster to me...

[MichaelsLilGray]

if its not however.. my tank is screwed.. cause there are like.. 40 of them in my tank lol

[Flake]

The one on the left almost looks like aptasia. I can't really tell though.

[rm86100]

so these are not harmful? what is their function?

[thominil]

They look like feather dusters to me too. They are NOT harmful and they filter feed.

[rm86100]

thanks for your help guys!

[melosu58]

Moveed to SW ID forum.