floating worm?

[online2]

Turn my lights on in my 55gal tank this morning and was checking on everyone, when I notice something floating. It was a worm of some kind (thin,1\2 inchs length, color black\sliver\grey depends on how it turned) floating by 1 end, it was trying to pull its other end to the surface. But before I could do anything to get it out, filter pushed it under the surface and my black skirt tetra ate it. :eek:
So, where did it come from and will harm the tetra?


Thanks
Online2

[Faramir]

Could have come from anywhere, and no, worms of all kinds are perfectly good food for tetras