First Timer Needs Advice Please/ Middle Fan Leaves 3 weeks 12/12 dying. Help pls!!!

pls could u give ur opinion? not to sure y the middle fan leaves would b dyin off at begining of 4th week 12/12 ! some one did say prob N def, i did give a lil on last feed, but desparete for them to finish !
WILL THEY FINISH? STILL GOT NEARLY 5 WEEKS TO GO ? pls leave ur opinions !!!!!
thanx guys ! nooby !!!!

just a slight nitrogen deficiency mate, the grow looks sound i wouldnt worry. if u added a bit of N now it wouldnt make any difference maybe slow the flowering down if anything and they use up all the nutes in the leaves now anyway.. let them finish now mate looks good imo
my mate that does a bit of growing as well, his plants have no green leaves at all close to the end but the buds are fat and sweet as!