Burmeseanswered grow question 5y ago Hey friend, I use Chicken manure,Tea leaves, hair and fish amino for organic Nitrogen source.But I don’t think you have serious nitrogen deficiency.I think you have Nutrient burn (burnt tips),light burn( dry and cripsy yellow leaves) and heat stress (leaves edges curling upwards). If your light distance to plant is actually 30cm( as you mention in your diary), you need to consider to move higher.Also before you do anything, try to check your runoff pH and ppm first.Problems come because of improper pH and nutrients lock out. Happy Growing ✌️