taco leaves

Does anyone know why this is happening to my 8 day old plants? Background: grew for 1 week in jiffy pot and transplanted earlier today (after giving vitamin B1) into 70:30 coco:perlite. I have been feeding tap water and yesterday they received the first dose of fertilizer (cal-mag...

Light MH 600 w dimmed to 400 w and place 22” above canopy Temp constant 23-24 goes down to 19 during night Then up to 27 for 30 mins during night also Humid 35-55 RH 2 oschilating 6” fans one blowing on top of affected plant (30 days old)and another blowing on another (14days) old seedling 1 10”...