these worms look like baby earthworms...not white or translucent. I have re potted my peace lily once before and found several of these little worms. Why do they keep coming back into the soil?

They are icky...I don't like worms of any sort....
I have thrown out the soil the plant had been in and all of the soil that I mixed and put back into the miracle grow bag...

I am starting from scratch...what potting soil is best?

Right now the soil less peace lilies are in the betta tanks.

Thanks,
Heidi
Minnesota