Something with nutrients or pH?

Question from a fellow grower:

Strain; Russian Snow
Soil in pots
System type: NA
PH of runoff or solution in reservoir?
What is strength of nutrient mix? EC, or TDS :NA
Indoor
Light system, CFLs 200w
Temps; Avg 30c
Humidity; <50%
Ventilation system; Yes,
AC, Humidifier, De-humidifier, NA
Co2; YES

Nitrogen toxicity, or root problems

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