A.M.S, BIG BANG & WARLOCK ( 4th week flowering)

Alright people, I'm currently in my fourth week of flowering, under a 400w hps, (and two t8's for side lighting) but lately ive had a lot of yellowing, and dropping of fan leaves, the big bang is looking particularly bad. Excuse a newb but this is my first grow, so not too sure what to expect, but i would have thought if *in ideal conditions, i would have had a lot more bud by now..
The warlock still looks amazing though and i've taken cuttings from each strain.
do any helpful growers have any suggestions on why my leaves are all yellowing/falling off though? and am i right to think so far that i should probably have more bud? :

AMS:



BIG BANG:



WARLOCK:



Im hoping its just lack of nutrients and that'll it clear up a while after being given these advanced nutes parTS a+b i got recently,
any feedback welcome ,
cheers people.
:leaf:
 
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