Northern Light Automatic first grow

Hey, this is my first grow ever and I'll be documenting everything here in hopes of receiving good advice, early error detection, and resolution for a successful first grow. Day 1: (01.03.2024) I planted the seeds directly into the substrate, using 15L pods filled with regular flower soil, and watered them lightly. The temperature is 21 degrees Celsius, and the humidity is around 62%. Day 5: Only 2 out of 5 plants have germinated so far, leaving me hopeful for the remaining 3. The temperature fluctuates between 22-23°C, with humidity ranging from 58% to 65%. The water pH is maintained between 6.0 and 6.3. The light, positioned 30cm above the plants, is set at 50%, and the time schedule is 18/6. I plan to wait until Friday (7-day mark) before gently burying the seeds to investigate potential issues. Day 5 Update, a few hours later: Pot 2 out of 4 has germinated (see picture). In total, 3 out of 5 seeds have germinated. Day 6: All 5 plants have successfully germinated (see picture). There is variation in size, possibly due to differences in burial depth. Light settings remain the same. During the first week, I didn't keep track of the water volume, watering them approximately every two days with a spray bottle when the top soil was dry.