Yellow leaves

Hey! Those tips curling down are signs of overwatering during a long period of time. Either you're watering too much or there isn't good enough drainage. You can notice your leaves are holding on to a bunch of water. I water everyother day for example and I always make sure the first 2 cm or so are a bit dry or else I give less water. Nutrients look good, PH is better at 6.2 in flower to better absorb the correct nutrients. Those yellow leafs on top.. could be light stress? Try raising the lights a bit. Also when you spray them, make sure the lights aren't on for too long or else it can burn the leaves. Hope this helped. Good luck and happy growing!