I'm not an expert, but the dark green leaves + droop tells me it's too much nitrogen, and maybe too much water also, or not enough. How often are you watering? Remember the plants need wet/dry cycles.

Better yet, go to the plant problems section, fill out the form as best you can, and put some pics up. There are people here who can help you out, but they usually don't browse around the grow logs.

Good luck :thumbsup: