Greenhouse Grow 3x Blueberry Zkittlez

Day 36: 🌤️ Another sunny day with little rain. Plant #2s pot feels light and I'm going to water that one tomorrow. In order to fight pests I have removed infected cucumber plants from the greenhouse and have sprayed everything vigorously with neemoil solution (1/100). I'm optimistic. Let's see. Pictures will follow. Day 37: ☀️ I watered plant #2 with approx. 4L of nettle leachate (1/3). I ordered PH testers so next watering and runoff will be tested. I have the feeling that the neemoil reduced the amount of bugs in the greenhouse. I'll keep an eye on that. I am worried about bud rot. The temperature is quite high in the greenhouse and the humidity as well I think. Weather sites say that humidity is around 80%. Greenhouse must be higher. I will measure this as well and see. Day 38: 🌤️ I put a hygrometer in the greenhouse it shows around 40% humidity which seems too good to belive but ok. Day 39: 🌤️ Soil of plant #1 and #3 are getting dry. I'm going to water tomorrow. I have bought some ph test strips too. My water from the well has a high ph, around 8. I planning to reduce it with citric acid. Day 40: ⛅ Today I watered each plant with 5L of nettle leachate (1/5). I used water from the tap and reduced the ph to around 4 using citric acid. The runoff water had a ph around 6. Day 41: 🌦️ Hot and humid weather with some rain. Noticed a browning on leaves of plant #1. Most likely the watering had too low ph. Other plants are fine. Day 42: 🌦️ Last day of week 6. Added a picture of the brown leaves. I plucked the most damaged one. I haven't adjusted the training stakes for some days.