Need an ID please!

[IndyReef78]

Can anyone tell my what the white tube with a red feathery thing is on the bottom of this frag plug? Is it some type of feather duster? And most importantly, is it harmful, because I have no idea where it came from!

 

[BranchingHammer]

Just a feather duster, no need to worry.

 

[IndyReef78]

Just a feather duster, no need to worry.

Thank you!

 

[BranchingHammer]

Yep no problem!