90s OG Kush cross Black Domina

Finally got my pH and ppm pen this week, I flushed the plant with 7.4ph water tested the run off and it was at 5.8 pH so the rain water lowered it a fair bit, the ppm was at 1800 which is my fault for feeding it a little too much power feed, I flushed it twice the run off on the second one was showing 6.9ph and 550ppm which is much better for the plant. It took the watering really well, I am a little concerned about the pre flowers I've spotted tho.