i have a six week old full sativa and my bottom 2 rows of leaves are yellow and falling of, if it is a nitrogen def will rain water cure that or should i use my 2-1-6 flor=a=grow, i want to flower it real soon, also i had a bug problem 2 weeks ago and used permiscous earth do i haft to flush that out of my soil because my soil is real hard from it, or will it be fine