Need some help identifying this issue.
Indoor grow, Canna coco, jacks 321 at 850ppm, 5.9ph raine science bags, ro water. I just recently flushed all plants with 6 gallons of ro water, followed by nutes at 850 ppm 5.9ph. Any help would be really appreciated!!
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Couple questions,
Have you calibrated your ph/ec/ppm pen lately? And whats your runoff hitting at?
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It looks like a gnarly ph fluctuation to me, maybe some calcium spots and a little potassium burn, what have you been giving her?
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With the bottom two pics I would prune off all the damaged leaves then give a foliar epson salt treatment like a teaspoon per gallon sprayed on with the lights backed down to 25% or so and the fans cranked up with all the air flow you can muster. Soak every leaf good, underside as well. 
after the leaves dry turn your lights back up to normal. Give that a few days and see how she looks. If no improvement add a dose of Calmag into her next watering. We can help you get them back on track my friend just small changes, one at a time till we see improvements. 
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How are you reaching this number? Are you adjusting the measurements? That’s a very low ppm for the recommended amount
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If you had to flush that’s an Indicator you need to feed more often and or achieve more run off. 850 is a find target for jacks and coco.
Keep in mind coco likes a 90-100% saturation. No dry backs. Plenty of run off each time.
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Just had similar things with one. Ive flushed and begin running to significant runoff. I wasnt going to runoff. First flush check was 3200. Possibly have a buildup if not running to runoff. I just usually forget the expansion of the rootball after watering them as babies. Try a good flush. I run my jacks at 13-1600. Might be a deficiency as stated above. In that case just increase feeding #s.
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remember a little goes a long way I always go with half of what the does your first nut should always be calmeg then I do silica and I do a 20/20/20 just a pinch in my gallon shake her up test the pH and feed
I have red devil drying that’s the single bud and chunky monkey which is hung up and drying now
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Just sounds good and looks great 
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