For future reference, if I encounter nutrient lockout, do nutrients in the soil get absorbed over time by the plant as I water with just plain water?

Thanks very much for the detailed reply

I initially thought it might be a calcium deficiency too so I upped the amount of cal mag I was adding in each watering from 3 mg to 5 mg per gallon and the deficiency still spread. I will perform a slurry test to measure ppm as well as PH and will update with results.

Thanks. By PH balanced I mean between 6.4-6.8. Should I not be concerned that the runoff is at 900 ppm even though the water I gave was 200 ppm? I’ll post pics when my lights are on tomorrow.