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The skinny ones are just common detritus worms. Extremely common, really, with new tanks like yours. They'll begin to disappear as your tank ages and their food source dwindles. Not harmful at all.
Planaria have pokey, triangular, pointed heads and are easy to spot. I zoomed in on every section of the video for a few minutes and they look and move like Rhabdocoela. While one of them looks kinda-ish like Planaria (right side), it eventually moves and you can see it doesn't have a triangular head.
If you're concerned, though, you could try manual removal with a turkey baster or syringe. Planaria/worm traps also work well. But I bet they'll all kinda disappear as the tank ages and you move critters in.
Planaria have pokey, triangular, pointed heads and are easy to spot. I zoomed in on every section of the video for a few minutes and they look and move like Rhabdocoela. While one of them looks kinda-ish like Planaria (right side), it eventually moves and you can see it doesn't have a triangular head.
If you're concerned, though, you could try manual removal with a turkey baster or syringe. Planaria/worm traps also work well. But I bet they'll all kinda disappear as the tank ages and you move critters in.
