Try increasing the water changes and lower your photoperiod to 5-6 hours for a few weeks. That's how I turn things around. It's boring but it works. Then slowly ramp up the light once things are under control and you begin to have a larger plant mass.
Thanks! I'm at school 8 hours a day, so I will need a timer. Which means I need 2, because I need one for my solenoid. I use a 23w 6500k CFL, ahould I raise it? It's about 6-8 inches from the surface.