Unsure, what are the signs for a feather duster? Googling seems like it 'could' be one. The tube is at the base of the rock and it extends out and waves around. Super active at night too.cool ,not a feather duster correct? looks fleshy.
Good to know I can get rid of it with ease. I don't want to unless it's considered a pest. I have a very new tank and would love additional diversityif it is in the tube and worrying you i think just getting it to retract and superglueing over the hole should just eradicate whatever it is