Northern Light Automatic first grow

Day 8: (08.03.2024) Some plants exhibit varying sizes, prompting me to take measures to address their growth. To provide stability, I added more soil to both the bottles and pots, as the plants seemed to be stretching excessively. Additionally, I adjusted the light distance from 30cm at 50% intensity to 30cm at 75% intensity. For watering, each plant received approximately 250ml of pH-regulated water, and no fertilizers have been applied thus far. Any tips or suggestions are highly appreciated. Day 10: I watered the plants with 2.25 liters of pH-regulated water. I did this to ensure thorough saturation of the entire substrate and prevent hydrophobia. The excess water drained out into the tray, which I subsequently removed to prevent the pot from standing in water. My pH meter has malfunctioned, and until I receive my new one in a few days, I have to estimate the pH level. Biobizz's pH-Down claims to lower the pH by 0.5 points per 0.1ml. Since the pH of my tap water is consistently between 8-8.5, I am adding 0.4ml of pH-Down per liter of water to lower the pH by 2 points. From now on, I will only water the plants when the top 3-5cm of the substrate is completely dry Day 11: I installed an additional fan because the initial fan was only reaching three plants. No water added. The plants have been doing much better since I increased the light intensity from 50% to 75% Day 12: The bottle plant has some weird marks. https://growdiaries.com/grow-questions/67103-is-my-plant-healthy I positioned the plant lower because it was 12cm higher than the others.