Good, bad, what are they?
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When in doubt take them out. They're not some form of stometella possibly are they? They look to big to be flat worms.I'm going to continue to search but my advise since we don't know what they are I would remove them.
I definitely agree when I doubt, get it outI'm going to continue to search but my advise since we don't know what they are I would remove them.

They were in the bag of black worms that I've been feeding my tank
Not really certain what they are, but a small leech seems a possibility.
~Bruce
Yes they will die pretty quickly in saltwater. So you are safe.Awesome info thanks for the help. Glad someone else has seen them. If from fresh water hopefully they will die

