Not about plants.

Too small to see but are they centapides?

was this container full of water at some point?

I think Nstressful is following the same train of thought as me. They look very much like mosquito larvae. If there was water in the pot, they'd be swimming.

they are, found these when we went pond dipping,

x x x

Thanks for that. I've just googled and yes, they are moquito larvae. That's satisfied my curiosity. Many thanks.

thats that problem solved