Found black worms in filter media

While I was doing water change and gravel vac on my 120g. (Whew) . when I went to rinse the filters that lay on a pull out drawer over the bio balls, had to get my glasses cause I seen something moving. there were over 50 of them, I don't know if I got them all out of the filters or not.. What

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Found black worms in filter media

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