Week 3 of flower in 7 gallon pots with hp promix. Im using general hydroponics 10 part system at medium strength.(ro water) Soil ph on plants are 5.9-6.5. Ppms of water coming out are no more than 1000. They are under leds, which are about 5 years old. Can you please identify what deficiency is happening?
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The plants dry out every 24 hours and i do feed,feed,ro.
I would bump that up or feed without straight water until TDS hits around 2,000 ppm (NACL scale) before doing water only. Leaves look to me like normal fade in flower.
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Welcome to the community 
Looks like you have a nice setup going!
Feed every time and skip the RO watering Growmie. Try to dial that PH in around 6.0-6.2 and keep the HP moist. Are you foliar feeding?? The leaves look like they’ve been misted with the lights on?? Check to see if the white residue on the leaves wipe off, keep the RH around 45-55% and are you supplementing calcium 
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