One of my girls is not doing so well. She's probably looked this way for 24 hours now and after watering 12 hours ago she's only gotten worse. Room temp is 74, rh is unknown, 24 hour cycle, 400watt MH in custom hood runs very cool and is 12" from canopy. Now she did suffer a small stem injury at about two weeks old but since then had recovered and developed new growth. All the other plants subjected to the same environmental and watering variables are just fine. Any guesses?