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What are this worms


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I cannot blow the video up enough to see (bad eyes)distinguishable characteristics. Three things about the locomotion make me think leech as @DaveO said. Inchworm movement. Shapechange with extensions and contraction and strong S swimming motion. Start with aquarium leech on a google search to see if you can identify it. 

Most are not harmful fish will eat them but a few could pose issue. Most common are the non harmful that live off  micro algae/bacteria. 

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