leaves are turning yellow/ pic

in my 3rd week of flowering 3 white widow plants under a 400hps, watered every other day with big bud, good air circulation, just bought revive from advance nutrients to try to bring them back to life, any help is appreciated.

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Is it upside down?

ya...i dont think i would be feeding every other day...just asking for a slew of problems...i'd try like a feed, water, water, feed type of schedule. i dont start every other day feeding untill they are nearing the last 2 weeks...then i pump it to them, with a nice leaching in between. looking like a magnesium deficiency...it is most common because with such a high p and k feeding like you are doing...it is easily locked out by that.

yeah how i snapped the pic on my phone it came out up side down, so just cut back on what im feeding it and i should be fine? what about that revive that is supposed to be specifically for problems with plants, should i cut back on that too?