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Calcium Deficiency??

Wow, there's something wonky with your ppm's. They should be running between 800 and 1200 max. I would suggest at this point to focus on the sick plant not the numbers you're seeing, but what the difference is between your Healthy plants and your sick plant. if you look at that it says your pH is higher and your nutrients are too low compared to your Healthy plants. I would still give it a good flush, double-check your PPM meter for calibration and method of checking your runoff for errors. I may be off base but that's how I'd approach it, like I said I haven't grown in promix so I don't know for sure. I hope this helps you get a handle on your problem plant.
 
I believe in letting the cannabis plant decide when it needs water/water nutes.
Dry medium in pot
Lite when you lift it
Even a little drooping with the leaf
In their life cycle it will change so it is important to be responsive to them but not over loving or neglectful.
From what you have told us, it sounds like you have a good grasp watering practice just need to correct the plant nutrition needs and build up.
If I could, I would suggest fabric pot for your future, very helpful with air circulation to roots and easy to tell when the pot is wet/dry.
 
When your pot is bone dry, weigh the pot.
When your pot is fully saturated, weigh the pot.
Half way between those two numbers is the correct time to water, in my humble opinion.
If you weigh the pots for a few watering's, you will get used to the 'heft' of the pot.
Folks say water when the pot is 'light', so this is how I determine what "light" means
 
Those PPM's are off the chart and the PH is on the very low side.
The plants will utilize pretty much all minerals adequately at PH 6.0 in hydro/coco/pro-mix.
As the PH gets lower it is more difficult to utilize some minerals. A few of minerals that drop off quickly are Phosphorous, Calcium, and Magnesium when and PH gets lower. The low PH makes it more difficult to utilize the minerals, even though the are available in the medium.

You asked if anyone had any ideas, so here it goes.

Pro-mix is tough to flush. It holds so much water that it takes tons of water and then they don't dry out so the roots could be oxygen deprived,(this is why I stopped using it)
Again, no expert here by any means, but I would flush with plain 6.0 water (perhaps starting out with 6.5) until you are at 6.0 (or close to it) coming out the bottom at under 1000 ppm.(EC 1.4)
I no longer believe in RO water.
I have absolutely no knowledge about your nutrient brand.
There may be something wrong with your PPM meter
I believe that your plants have all the minerals they need to be healthy, and more, but the plant is not able to utilize the minerals that are available to it.
 
When a company tells me that they have known problems when growing in Pro-mix, I would take that as advise to not use Pro-mix with their products.
 
Agreed Flockshot, I haven't seen many positive benefits to Pro mix just people with problems in the last year, I'll stick with coco.
 
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