Seen thread on problem but cant find the answers now.... outdoor sativa,centre of small leaves around 3wk old buds are going almost luminous bright green/yellow. Some end buds going brown, dont mean hairs,mean bud going BAD. Never seen b4 and cant find similar photod. Maybe lack of a nutrient like phosphoruos?? What can i do. Bought nutrient energy boost, no diff in 4 days. Help!!?