If it's a bristle worm, they are just fine if not beneficial to your tank. They eat poop.
If you get a big sucker (I say 3" +) I usually take those ones out just because they are so big and gnarly. But wee ones will be just fine... But don't touch them with your bare hands... you'll do it once and never forget it...fiberglass like splinters in your finger. I recommend duct tape for removal!!
EDIT: And for confirmation, always best to post a picture for any sort of I.D. Try to snap one so we can take a look-see.
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