Help ID this Deficiency Please

Thanks for the reply. Its in a DWC 5 Gallon, with 10 inch net pot. Nutrients are weekly, 1400 including 50 PPM liquid Karma and half a dropper of calmag, the rest grow. PH kept at 6.3 and need to replace about half gallon per day.

My guess would be a Nute lockout. Your tips are clawed and burnt, which points to nitrogen toxicity. Usually when the water is to saline (salty) the plant overcompensates by creating more sugars to cancel the salts, that usually leads to a nutrient lockout. I would suggest you go easier on the nutes, and see if the problem fixes itself, if you see it spreading then add or increase your calmag additive keeping in mind the EC and/or PH of the water.