Hi
@Mosephvon! My guess is that your leaves are suffering from heat, and a poor airflow, as a result the leave's tips are slowly curling and burning. To solve this issue, you can increase the distance between your apical summits and the lights, you can add a small rotating fan slightly blowing onto the plant's canopies, or you can try to decrease your daily temperature, by reinforcing the global airflow or by putting iced water bottles in your grow tent every morning. Hope this will help, keep us up-to-date and happy growing 👊