Sounds like they could be black worms ( Lumbriculus Variegatus) good
for feeding fish. But I have never heard of them clinging to rocks
like that. Local pet stores sell black worms to feed tropical fish.
Maybe they could id them for you.
"Sam Hopkins" wrote in message
.. .
Hi Everyone,

I have a question about some worms that I found. I recently built
a
large pond and life is starting to take hold. I discovered millions of
crazy
worms and I was wondering if someone could help me ID them. There are
large
limestone rocks (fist size) directly outside of my outflow pipes.
Yesterday
I noticed that these rocks were completely black (we're talking 100+
rocks)
I had thought that it was black algae common seen in aquariums so I
picked
up a rock to check it out. The rock was moving! It was 100% covered in
these
1/4" worms. The water is moving fast. Like 100+ gallons a minute so it
cant
be mosquitoes. The rocks are completely submerged in water. Anyone
have any
ideas what these are? They have not been found anywhere else in the
pond.

Thanks,

Sam