Looks like a type of Naiad. Look up Southern Naiad or Bushy Pondweed and see if that fits what you are seeing. It doesn't look like Chara to me, but it could be that too, next time you are there, crush it some and roll it around in your hand. If it smells like a skunk it's Chara. No skunk, then not Chara.
Will do thanks. After looking, it seems like S. Naiad.
