RQS Quick One / Slow One

Day 78 - starting 3rd week of flower. I have done a fair bit of defoliating over the past week, fairly happy with where it’s at now. The screen needed to be removed temporarily due to extenuating circumstances, will go back on shortly here. The plant is doing well and is ready to start forming buds shortly. Still having tip burn from my lights, I think better LEDs are an order for the next grow. Don’t seem to be having any nutrient issues otherwise, she’s looking healthy. Just watering with pH adjusted and filtered water as always, no fertilizers added. I adjust pH with lemon juice and use a meter to test. I’m having trouble understanding why crazy fertilizer regiments are needed to grow quality weed... perhaps I’m ignorant though lol.