I'll get some pictures. There are several patches of it and its gotten pretty thick but only in a few spots where its less than a foot deep or so. Looks a lot like coontail pictures online. Kind of like minature seaweed but the tentacles are more like a scraggly christmas tree.
I am amazed at how fast some of the water lilies have grown. Was just a tiny plant this spring. Might be some thinning in a few years.