please ID worm?

an-tron

Member
My tank is nearly 2 weeks old. I bought one rock that was 13 lbs and at first, appeared to have no critters. Today I woke up to find this worm looking creature way on the other side of the tank. His tip appears to be stretching out and moving him around when I turn on the light. Please help me ID anyone? If its good or bad? Pictures are blurry but i'll start with the clearest first.
TIA
 

an-tron

Member
those were with the lights on. WHen they are off, he stretches a few inches about 4.
heres a pic of how skinny/long he gets. it appears he's eating stuff on the sand?
 
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