This is my first time growing I got me a 4x4 ebb and flow system. my plants are about 7weeks old. There about 2feet tall now. I was using a humidifier in my grow tent and notice that the two plants closest to the humidifier leaves were burning so i stop the humidifier. But the leves are burnt so should i cut them off or leave it alone? I have the Sour Grape strain so when should i go to 12/12 hours? Any help would be great thanks.