I wrote an article on Vallisneria. Just about everyone could use some Val in their tanks. Not only is it super easy to grow, it looks great and does well under low light.
If you're interested have a read:
http://www.tankgeek.com/2011/01/24/vallisneria-–-plant-wonder
If you're interested have a read:
http://www.tankgeek.com/2011/01/24/vallisneria-–-plant-wonder