Potassium deficiency

Can you provide a pic in normal lighting so we can see the actual colors of the leaf? Also, is the damage on one part of the plant, right near a fan? Looks a lot like wind burn.

Hi, you could be right but it's hard to tell with the red lighting. Can you take another picture in regular lighting, that would help. Some basic information on what you are feeding her would be good too and the PPM reading of the run off if you know it.

And just from personal experience, the first time I experienced a potassium deficiency I feed her more and more potassium ... she died. The second time it happened I realized it was a potassium deficiency caused by a nutrient lock out. The solution was to flush the heck out of her with PH'd water and then return to regular feeding.

Don't take this novice opinion as worth much but judging solely off those two pictures I'd say you cracked the case.