Querkle N def?

Hi. This is my Querkle (space queen X purple erkle) she is about 16 days into flowing. I will get a better picture tonite if necessary. Shes in 70% Gold Label Coco/30% perlite under a 600w HPS. i think she is getting N deficient... this problem is only visable on the lower leaves so far. its been about 3 days since i first noticed. Im using General Organics Grow (4-3-3) and Bloom (2-4-4) alot with Roots Xcel and Hydroplex. Am i right about the deficiency? if so... should i add a little bit of Grow into my Bloom solution? would mixing them evenly make a solution that is 6-7-7? Or is this normal for some strains... I use tap water but always let it distill for atleast 24 hours-3 days. My PH is around 6.0-6.3 and the temp stays around 75 lights on and 65 lights off. I live in the mountains and think our tap is pretty good. i flushed her pretty good yesterday so when the light turns on ill give her some food. Any help would be greatly appreciated. hope i didnt leave out any important info.
Edit: Its hard to tell by the pictures i provided... but the fan leaves are noticeably more yellow. Ill take a picture in a bit and take it outa the bright light.

get some cal mag+ and run it at 5mil/gal threw entire grow you can spray with it too
mag dif is common w/coco

the cal mag has some N in it as welland it will help take in the n from the nuits also

Thanks for the quick reply. I have been trying to get a sample of the General Organics CaMg for a while. Do u have any recommendations on a relatively cheap CaMg? I have heard Epsom Salts work aswell>?

i wouldnt and any salts personally i use botanicare's cal mag+. i think salts would take away from flav but dont know 4sure

day 21 now. problem has gotten worse. no funds for a mg/cal supplement for a week. any quick fixes? im assuming this is too early for leaves to be yellowing this much... buds look nice though... upper fan leaves still look healthy green...

MG all purpose plant food .5 strength

as i said i will not be able to get any kind of MG/CAl supplement for about a week. Will this hurt my harvest? is there anything i can immediatly do to help her get to next week? im assuming 21 days into flower is a bit to early to start using up the shit stored in leaves and i dont like it!

your fine, my garden does this every cycle. it would be bad if it was the new growth coming in yellow but your ok. i pull em off after they turn yellow AND limp, even the huge fan leaves. your yellow leaves have some life (green) left in them so i wouldt pull em yet.

also, mine do this even though i supplement cal/mag.

great. thats exactly what i wanted to here. thank you!

looks like ur plants are just shedding, during flowering plants often loose lower branches that dont receive enough light, usually starts happening once the bud sites start putting on pistel hair