dieing

Hi all as the title states in having some issues with my plants, This is my first Hydro grow after a couple of years of successful soil growing. Everything was going fine until a 2 days ago when I noticed that some of the plants leaves we're yellowing, turning crunchy and shiny in some spots...

12 weeks in on plant. Coco coir grow. 2.1.1 nutrient ratio because started feeding at 10 weeks. Major lighting issues during plants young life. Fixed issues by upgrading from 15 watt led to 300 which cause the plant to have a beautiful bloom. Just noticed although, some slight early damage to...