Um...there's a worm in my pond plants

[MK3]

I just noticed that the soil in my mare's tails has started to look like yarn. And I saw a tiny red worm wiggling through it squirting out the soil, which is creating the effect. Is this good or bad for the plants?

Tried to get a picture:

 

[MK3]

And the problem is that the worms are pushing all the dirt to the surface, which then falls into my pond.

 

[MitchM]

Unless proven otherwise, I welcome all life forms into my pond.
Diversity = stability.

 

[Mmathis]

I would doubt that the little worm is doing the earth-moving [though it could be -- just saying,,,,]. Do you have fish? My bet goes to fish digging for a wormy snack!

And what @MitchM said......