Long time fan, first time growing

Bit of a struggle in the grow this week with the Amnesia Haze & Blueberry showing sings of nitrogen toxicity. Dark green clawed leaves particularly on the AH. I flushed both plants with approx 10L of de chlorinated tap water over an hour or so and started measuring ppm ( 1700 ) of the run off and the pH 6.1. Got ppm down to 750 and ph'd the water used to flush at 6.8 to keep it in the sweet spot. Added an extra fan to help dry the soil out which took around 5 days and didn't use any nutes next water. Both plants are getting taller and gaining bulk I did some lst at the end of the week.