Plant identification

[albert einstein]

http://www.angelfire.com/ut2/fish0/Fishtank1.jpg
Can u guys help me with a plant identification.. I need to know what the plant is behind the Red Ludwia?? Currently the stem seems to be rotting!! I need to know what the paramaters in order to treat this problem..

[Sum-X]

It almost looks like River Bacopa, but I cant be sure...

[djlen]

Dark.......very dark!!!!

Len

[125gJoe]

Yes it does look dark. Can you lighten up this subject?