Zkittlez auto & Gorilla glue auto

I avoid foliar spraying at all costs. Unless my RH is extremely low or I need to fix a nutrient deficiency quickly, I won't spray, and dont recommend it either. Foliar sprays cause more issues than they solve IMO.

I had a quick look at your diary and they look pretty nice so no reason to panic too much. Your pot size is 15L so if you want to flush what’s in there out I would start and 3x the pot volume so 45L. Strange it’s dropping but maybe there is a build up in the middle to upper layers of the soil which is working it’s way to the bottom of the pot the more you water it. I am no soil expert but would definitely pour a load of water through until ph is back in range. Probably take them over a sink or bath etc.

Before Flowering in my opinion. like after 3 weeks they can start to take a lot of light.. Turning up the light now will probably cause a negative or adverse reaction. So be prepared for that if/when you decide to. When the amount of photons increase the amount of transpiration and intake increases.. You already seem to be having a few nutrient issues and cranking the light up will only give you more issues. But that being said Light is one of the most important things for cannabis growing.it has the biggest impact on yield. It's always better to have plants grow into light and to gradually increase things then it is drop the light 6 inches or crank the light up 25%.. 100% power 24 inch height is what I'd be doing with those lights but I am in hydro.. And Transpiration is a huge part of plant biology and Water is required for transpiration.