Hi everyone, First post first time grow, not new to the weed. My question is I started two plants there about 3 weeks old. Have 2 300w led lights about 18 in above plants in foxfarm soil. The tips are turning (yellow} on the bottom leafs and the tips are curling. I am using nuts Foxfarm Big bloom. Tiger bloom, and grow big. Now I am only using the grow big and big bloom at the moment. I am also NOT giving full strength, mayby a quarter of what they call for. I thought because of age I would start off easy and f-farm has nuts in it. Other then the tips turning the plants look good. Pics could be better. Any and all answers will be a big help