Is it dead?

[Cal_stir]

I would, I don't think it's dead

[Ryan]

I would leave it. As long as nothing is picking on the worm it will be okay and build a new tube.

[viperfish]

I wouldn't bury it, the tube is used to protect it from the substrate so burying it will damage the flesh. Get it in a low flow/low light area of the tank so it can start a new tube.
Just curious, what kind of substrate is that in the pic?

[fishykisses]

It's Tahitian moon sand, I'm going to move him to the big tank, less flow and lower lights.
Thanks