If your nitrate is only 1 ppm and your phosphate is near zero, then, most likely, you are not providing enough macronutrients to your plants. You should try boosting those nutrient levels to around NO3: 10ppm, PO4 1ppm give or take.
After reading your dosing routine so far, I think you are seriously underdosing for your lighting level. I would try increasing your TMG and Flourish Iron dosing to around 20mL of each per week... AFTER you get your macronutrients in order.
Carlos |