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Hello, At the end of the light cycle, the leaves should droop down, indicating that the plant is tired. If you're using nutrient-rich soil like Biobizz All Mix, it's not necessary to fertilize with additional nutrients in the first five weeks. If you're using Biobizz Light Mix, I believe nutrients should be added earlier. The nutrient application depends on the type of soil. I personally use my own super soil mix and have learned over time to recognize the plant's nutrient needs. Honestly, if the soil is rich, you should only need to add bloom nutrients during the flowering phase. Check the soil moisture at the surface before watering. If the soil is still wet, wait until it's about half an inch deep dry. Water with pH-balanced water. During the dark phases, use a foliar spray made from a mixture of Epsom salt and water for better magnesium uptake. Be patient, and soon everything will be fine. Good luck, buddy!

could be NPK deficiency water it underneath the stem and go around

Most likely over watering with seedling and plants in veg. Also could be a combo of to much light when it’s trying to recover I suggest lowering light power by 25percent for a week. Also let the soil get super dry the plant will start to perk up even if it only perks up for a few hours in the afternoon after the plant has a few days of looking better it will start to show signs of underwater you do not want to water until this happens It can take plants up to 2 weeks to recover from over watering but only 2 or 3 hours to bounce back from under

If you're already saying that the substrate was overwatered for a long time, it could come from that. But too much light or too little water can also cause such symptoms. What substrate are you using? It looks like coco. Actually, it's very hard to overwater coco. In the pictures, the substrate doesn't look like it's overwatered.

To much water💚