First grow - Auto Hindu Kush

Plant is looking a lot more purple than I expected. Noticed some deficiencies in the plants later in the week, a couple helpful lads suggesting it is nitrogen toxicity. I have to guess this is due to the last feeding I did adding equal parts all-purpose and flowering stage Gaia Green. Probably too much of both and for sure too much of the all purpose. I attempted to flush the soil as much as I could today, it brought the ppm down slightly but i didn't have a lot of time to work it. Next watering I'll try and flush it a bunch more as well.