yellowing please help!

hey guys!
So a buddy of mine is having some problems with his grow hes trying to get it on a 2 or so week cycle so that he can have a continuous source of meds, hes grow ing in a closet about 2 ft wide 3 foot in and roughly 3 ft high, using a 430w son agrow hps (as a local head shop recommended) growing in a soilless pro mix , problem is as soon as the plants are being moved over from the veg room to the 12/12 room they start yellowing we originally thought it was him over feeding nutes( DFA A/B Nutes) so we flushedd and we are still having the problem, all the meds that doo make it out are WAY too small for a 430 hps! and taste's nowhere neer what they should be. We are jsut really frustrated and would love some help from someone more knowledgeable then us!
MUCH APPRECIATEDD!

also we dont have much of ventalation in there so that could be a problem, we are trying to fix that now,

yellowing like that is from a deficiency
if is was nute burn it would be on the tips and edges of the leaf

take this
View attachment 1653781

nitrogen deficiency more than likely
alot of flowering nutes dont add enough in their NPK

try something with a higher N value

or if you think its one of the micronutrients... get something like microblast by earthjuice or liquid karma by AN

what is your p.h mine yellow if my p.h gets to high i keep mine between 5.5 and 6.3

high or low ph can cause a nutrient lockout, the plant becomes unable to absorb the nutrients... but its still a deficiency
gotta narrow down the suspected causes

how far along is that plant

Yeah thats a deficiency for sure like Mystified said..Nute burn is just edges..

ph is off and a deficiency. and keep in mind, like mystified said, if your ph is off, it will cause a nutrient lock out, so it turns into a deficiency. You and your buddy should get a ph meter if you guys can.

we have alreaddy them ph stip testers for like pools and stuff im pretty sure ill have to double check today but i think he was sayign his ph is staying around 6.5/ 7 but we jsut got the ph strips like last week so it deffinitly could be that our ph was outta wack, however if it is a lock out what more can i do for the plant? still boost the nitrogen?
sorry ive personally jsut never run into this problem with my personal grows, so kinda stumped as to what to do.
i think me and my buddy will be heading over to the head shop today, but im almost flat broke so i neeed to find somthing cheap that will help this problem. any suggestions ?

and the plant in that picture was put into the flower room at 7 -8 inch so that one has probly been in there for a good cupple weeks if not a month.
butt thats a plant under a 430w hps and the buds arnt getting much bigger then the ones in the picture, like each time we pull we were hoping for atleast a half per plant and it turns out because of these problems we are gettting MUCH less then a half per.
Just really frustrating.

his ph is staying at 6 he said today, so am i jsut trying to boost the nitrogen in my fertilizer? anyone have any idea of what to add ?

Well Still having problems here!
weve fixed ventilation so cant be that , but the plants jsut keep yellowing as soooon as there moved over to the bud room, i dont know if its because of the nutrients we are using or what but the buds are still coming out fluffy tastless/harsh and the weight is horrible for a 430w hps I Neeeeeeeeed Insight as to what i should be doing!
Please helpp! Reps all around!

Main reason we need this fixed and working perfectly is because we are trying to not only grow ourselves meds but help out a cupple of friends if we can.

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