Leaf septoria. Read up on it. Trust me..do the research cause if you don't you could possibly battle this for years. Use a spray called Serenade to halt the fungal disease. Good luck
I believe that the brown spots on the leaves is Impatiens necrotic spot virus or a similar virus. As for the yellowing it seems to be an extreme Phosphorus deficiency. I would foliar feed your plants with some microbiology and also add some biology in your soil if you don't already. I would recommend products like organic all phase or a company called microbe life hydroponics they both make excellent products with several strains of bacteria and fungus to combat the INSV.
Looks like Potassium, phosphorus and possibly heat stress as well. Phosphorus the leaves yellow and potassium they yellow with brown spots and spots. What are your temps at?
I went out and bought some epsom salts, and some Bontanicare bloom grow formula. Here are a few more pics as well. The plant is flowering and all the leaves are yellow on the insides near the nodes where the buds are forming.
Not sure on the PH, i use bottled water. And strain is northern lights not sure what you mean by breeder exactly