My plants have seemed progressively 'droopier' the last few days. At first it was only during the dark part of the cycle but now its most the day. My plants are GDP and are 2 weeks into flower. Temperature has been a bit erratic recently, dropping to around 60 during the dark part of the cycle, and mid 70s during light cycle. The issue is the the leaves are not sticking out - reaching - as they did, particularly newer leaves on the top. THey are curling downward like claws. They are dark green.. I'm not sure I'd call them 'purple', but they do seem to darker than ideal. The issue is primarily affecting the largest plants, but some of the smaller ones are exhibiting it too. After reading up on the grow bible, it sounds like the most obvious culprit has to do with watering... but if it is, I'm not sure whether its over, or under-watering. I have two trays, a 3x6 and a 3x3. The 3x3 is attached to a standard 400gph pump, and is currently flooded for 10 minutes at the beginning of the light cycle. The second is a slightly more interesting case.... the 3x6 is attached to a 1200gph pump. With a 40 gallon reservoir, it'll drain the entire reservoir (and flood the tray full) in 2 minutes... at which point I have to let it drain or the pump sucks on air. Since the tray isn't flooded as long, I have had it flood more often. Last night it flooded twice... at 10pm and 12:30 am, 12:30. The problem is present on both trays, though its more pronounced on the 3x6 because most of the large plants are on that tray (doing a semi-SOG grow on the 3x3). Ideally, yes, I'd change it to a smaller pump but it does seem to work and until recently everything was okay. Besides, the issue isn't only affecting this tray. I lean towards 'under' watering, because its mostly affecting the bigger plants (which I think would be the least susceptible to over-watering, since they can use more water), and because its happening mostly on the 3x6 tray, which is only flooded for two extremely short timeframes. I'm looking through some of the 'self-diagnosis' threads and it seems a few other things might be doing it. So I figured I'd post the symptoms and pics and see what you say. Thanks for the help!