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OMG, It's so scary, man. This creature could kill all your fish. Frankly speaking, I read about these worms, but I never thought, that they could be met in our lands. It was the ARC Reef's article, it turned on, that we were surrounded by them. So, the danger was much closer to us than we thought. How am I going sleep now?
Looking at the head, I have to disagree on the Bobbit worm ID. This is exactly what a feather duster worm that has blown his feather head looks like. ( There should have been a head in the bag you received this in. If not, it was sent to you with no plume.) As long as the worm is alive, it will secrete a mucus and create a new tube out of your substrate and eventually regrow it's feather head. No guarantees it will because it depends on the condition of the worm and what caused it to blow it's "lid" It just takes time.