Plants yellowing, EC not dropping

  • What strain Blue Dream
    Seed bank
  • Method: Hydroponics DWC
  • Vessels: Buckets
  • PH of Water 5.8-6.2 Solutio
  • PPM 1120or EC 2.2
  • Indoor
  • Light system 4 1000 watt hopsstrong text
  • Temps; Day 82 Night 73
  • Humidity; Low 27 high 37
  • Ventilation system; Yes
  • Humidifier
  • Co2; No

The plants look healthy aside from yellowing (week 3 of 9 in flower stage). Any help would be appreciated!

What are your water temperatures?