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Cases like this prove that lighting has more of an effect on algae than nutrients do. Sit a bowl of r/o or distilled water out in the sun for a few days if you still don't believe that. It doesn't help to run a shorter photo period if the intensity of said light exceeds the nutritional needs of the plants. I would start by dimming lights by either raising them, adding a screen over the top of the tank or by the use of an inexpensive pwm dimmer. A photo period of 6-8 hours is fine. I would also recommend getting your plants on a balanced diet as mentioned by @Surf.
 
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