Quick One - First Try First Grow

Day 8: I've watered the plants with 500 ml water with only a half of Easy Grow Booster Tablets in 4L water (pH: 6) Day 9: Adjusted the lights to 20 cm for each plant. Weather is cold and rainy for last few days and I feel like plant is not growing. I'm not sure these weak lights will be useful at all. I guess we will see. Day 10: Watered again with 500 ml solution (pH: 6.3) Day 12: Watered the 30L pot because it was dry enough. Used 1L solution (pH: 6.4)