In the front you could do some java fern and some java moss. Those are small and good looking. For a colored plant go with the red wendtii (sp) I have one and it's really doing good and getting big. For the back I would suggest some giant hygrophylla. They do good and look pretty too. There are many others out there it just depends on what you want. What kinda fish are you going to put in it? If you do certain fish you could do some swords and other neat plants. ;D Good luck.
