I have a few 5 week olds and I am having continually worsening problems. Over the past couple of weeks they began drooping at night, developing brown leaf tips, and the growing medium they came in( they were clones) has white spots which are now a full fledged mold and or fungus. They have been under a 400w hps at about 12 in distance on an 18/6 schedule. These are hydroponics, so I give them one 10 min ebb and flow cycle which I just recently purged of nutrients because I thought they had a nutrient overload. This was obviously not the case because they have gotten worse using only regular water. The temp stays between 65- 79 and the humidity between 45- 60. The first picture is them at their healthiest, what you cant see are the slightly burnt leaf tips, and the second picture is the mold problem. The 3rd pic is a far view of roots and medium. The fourth picture is taken after 16 hours of light and shows the drooping compared to earlier that day.