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I see several problems there my friend, firstly your lighting isnt quite enough, you have excessive streching, yield will be affected by this.
several plants are nitrogen def. & a couple look like they need a shot of magnesium & your way too early in the budding phase to experience ANY def.'s
I see one plant is curling badly at the bottom, most likely previous nitrogen toxicity, so
to rule out PH related issues complete a soil runoff PH test.......
with PH corrected water (6.5-6.8PH ) pour enough water in the pots so the water runs out the bottom of the pot ...test the PH of this water....
in veg I use NPK: 24-8-16 I almost dont need any ferts during bud, just a boost of P & K in week 5
your ferts that your using are weak in strength... NPK 3-1-5, at bud production time the plants are calling for more nutrients and they arent availble from the roots, so the mobile elements are being transported from the older fan leaves to support the new growth & your leaves are yellowing
bottom line they are starving, is it you or PH?, do the runoff test you will know what to do
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