Rqs northern light auto, cheese auto

Hi fellow growers, the cold came in our country and the temp outside went to 6-12*C so my heater had to be in the tent. Because the plants growed to big the heater i used before is to close to the plants and for safety i orderded a tube heater special for greenhouses. When i waited the plants had to cold and as you see on the pictures 3 of them turnend purple. I hope this temp shock isn’t gone damage the plants. Doe the rest i kept watering the plants with the rqs tablets in 6l rainwater. Happy growing!