Looks like a form of aquatic earthworm... i encountered similar ones in my previous tank that was growing out a HC carpet via DSM (they probably hitchhiked in with the plants).
Here was the thread: http://www.aquaticquotient.com/forum...Method-Journal!
After the tank was flooded, those worms continued living in the soil for months after that. They were harmless though so i left them to help aerate the soil.









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