I've got 18 GP clones right now, who just started growing. After transplanting them into their 3 Gallon buckets, they took over a week to change at all! Now the're growing great, 1-2 inches a day! Im using SunSoil and Advanced Nutrients Grow/Bloom/Micro, as well as advanced nutrients Growth Excell. We had some droopage problems as well, but basically the watering schedule is about 200 ml's every other day in the three gallon pots. For drooping, I found, that they needed water more than anything else. Yellow is just Nitrogen difficiency, maybe you want to flush your plants. Also, if your room gets cold when the lights go off, it seems to cause droopage as well. Cannabis is an amazingly resiliant plant, as delicate as it is.