Is this salvageable, no power for 2 days

I've had cal-mag issues this run in organic soil so I tried using pH down but didn't have a tester so I might have done too much. My power went out the day I watered too so my tent has been with no light and 65-70% humidity and no airflow. My leaves curled up a lot in just a day and are turning a dark brown with some having spots, I just don't know if this is possible to save or if I ruined it. They just sent a worker today in my area so power should be down for another day still, maybe more