1st grow cookies gelato RQS

Wednesday 1/10 start of week 4 haven't watered/fed since 1/6, and plants show no sign of needing water or food, I will be watering them with just pH-balanced water the moment the leaves show signs of thirst(leaves/stems drooping)and hopefully get rid of the yellowing and browning. the yellowing/browning seems to have stopped spreading since last week too, I thought it was nute deficiency but a couple of people on here told me it was nute burn/toxicity, and seems like they were right since it hasn't spread since. the 40 ppm measurement is my water before adding anything to it, some people were confused and thought it was way too low. I'll be measuring the ppm of the water after everything is mixed in the next time I feed them, I'll also be measuring the ppm and pH of the run-off water when the time comes all the plants are growing slow and steady