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Worms in newly cycled tank

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The tank has been running for about 3 weeks. Plants and a couple of fish have been added. Today I noticed a bunch of small worm/ larva looking thinks wriggling around. Can anyone identify and are they harmful?

thank you

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They don't look like typical aquarium worms to me, more like the larval stage of an insect. Can you remove them to another container in a bit of water and take another pic or two?

It might be dragonfly or damselfly nymphs or it could be something that came with your plants.
 
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