Deficiency or toxicity?

Looks like to much fertilizer, and/or too much light.
It's possible to grow great dwc plants with 350 ppm (500 scale) from seed to harvest.
I'd reduce the feed to 400 ppm that include CalMag, and raise the lights.
Too little food/light will slow growth slightly.
Too much leads to what you have.

 

>Ppm was reading 550 now at 850 to see any difference it would make.<

Did you notice if the leaves started to look like this after you bumped the ppm to 850?

If so, thats the difference it made. I agree with backing off nutes because your growing in DWC. You dont have to push hard in DWC, allow the oxygen in the water to work its magic.

* Also note - keep your eye on yoir plant everyday, because if you make a mistake with nutes, you'll see it very quickly. Allowing you to put her in plain water and re-evaluate the plan...

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How do your roots look?

 

If you have already started over with fresh water, hopefully RO water, just add the minimum amount of CalMag. Try to keep the water Ph as close to 5.8 with the PPM less than 400. Let it grow for 7 days, keeping plenty of fresh air around her with a fan oscilating. Also, dont forget to drop several drops of H202 in the reservoir to keep the roots bright white.

You have the right idea, greatly reduce the nutes until shes back to gorgeous.

Good luck...

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My opinion is that you bumped up already too-high nutes.
500 ppm would fry my plants.
pH is better kept around 6.0
You might have too low humidity. Google Vapor Pressure Deficit.

I think you have too much light, too much food, and too low humidity.

 

Also check the water temp... ideal water temp is 68°F. Once it gets above 74°, you'll have more problems.

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