This is dwc it only takes about 3days to flush..you dont have to ph the water remember your flushing. If your using ro water about 100ppm of calmag and sweetners are all you need.
Are you seeing any purpling in the stem or stalk of the plant. Does the stem and stalk show to be purple in color and also the way your leaves are curling up you may have a ph issue... that leaf is also showing signs of light stress how cloae are tour lights