Full strength because was getting nute burn so then flushed went down to halfstrength now getting yellow leaves any suggestions. I then put the nutes back to full strength last night and more yellow leaves start popping up. Do you guys think it could be to cold in my room iam now going 12/12 and my air condition was on every night. I put my hand in my resivour this morning and it was cold. what should my temp be in my tank. Could that make your leaves yellow if water to cold while lights are out.