The lighting that comes with the tank, isn't the best for growing plants. It's mainly for lighting it so you can see into it. Florescent lights are fine for low to moderate light plants. All you need is a lamp in the 6500 - 6700K range. The light blue color is recommended for aquatic plants. You can use the old "watts per gallon" rule with florescents. Get the lighting into the 2 watts per gallon of tank volume range and you should be able to grow a good range of plants.
"Fear not, my young apprentice. Just change the tank water."