Just an update, the green water is finally gone, not sure exactly what did it but something must have worked. Started dosing nitrates and phosphates to the recommended levels, and also potassium, iron, and flourish. It didn't clear up right away. I was using the diatom filter weekly to clear the water of the algae. Finally after the last time I used it, 3 weeks ago it has not come back. The water has remained crystal clear, clearer than i thought possible without a diatom filter. I've had this green water for close to 6 months so I'm very glad it's gone.