Any idea what this brown short strandy stuff (algae?) is in my pond?

[Zuke]

Please see attached photos,
My pond is 4000-5000 gallons and only had 1 goldfish in it up until a few days ago - i just added 10 4-5 inch Shubunkins, the strandy stuff was appearing before I added them. I just recently added 2 water hyacinths and a potted lily pad a few weeks ago, in one of the photos you can see the brown stuff is attaching to the roots!

I have 2 55 gal static bed drums
Any idea what any of this stuff is? Thanks so much

 

[JRS]

Looks like just another type of algae as you thought. In the absence of more concentrated food, the goldfish should work on it.