I know it was not a feather duster as I have a TON of those on my live rock and this does not have the tube and is always open 24/7, plus it is solid not feathery like the dusters. It is a shame it is dead it would have been cool to have a live coral with the rock!!!
There really isn't a way to take it out as I would have to pull apart all my rock... So as long as it is not hurting anything I guess it can stay!
Thanks a bunch!