What Kind Of Plants Are These?

[l_l_l]

Hey, wondering what kind of plants those long lace like things are in the first aquarium?
Really would like to get some for my low light setup!
http/www.youtube.com/watch?v=rI5IBiCpxkc&feature=share&list=UU4j90aZYe6v7J4Yb6qpbiLw&index=3