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Not sure. I think u r right. I'll try to get better pic. Don't know how they managed to make their way to sumpHard to tell from the photos and videos but they don’t look like flat worms. Your description of circular brings spirorbid worms to mind though. Google that to see if that’s what you have
I had now tried with some lights. I think they r not movingIf they’re spiros, that’s where you will normally see them. Harmless filter feeders that like the dark. Probably just means you’ve got high nutrients