i have a worm in my marine fish tank Help!!?

[scuba man]

its is not that big at all, rather long and skinny and the best thing of all it gives of bioluminescence, kind of like a bolt of green electricity going down its back
what is it??? i have no picture sorry
it must have come on my live rock that is in my tank. i have extracted a lot of brittle and fire worms over time (2 ) and now im seeking out them dam crabs >

 

[HIHI karin =] no duh]

go to a fish store where you bought your fishes at.

i say you should take it out. o_o you have no idea how it got in? no idea what it can do

 

[HIHI karin =] no duh]

go to a fish store where you bought your fishes at.

i say you should take it out. o_o you have no idea how it got in? no idea what it can do