Originally Posted by Herbus
If your leaves are almost like a deep green approaching blue color this is almost always NPK overdose. Normally it is N. The 1/2 bent over leaves is normally from too much water however, since you will need to flush the excess nutes I think this might make the bent over leaves even worse. I guess if it were me i would flush each plant with enough water that some spills out the bottom. Try to capture the water spilling out and check too see if the coloration of the nutrient solution is coloring you waste water. Of course this only works with chemical nutes (usually deep blue in color) and not organic nutes for these you would need to borrow or buy a meter.
Good luck with them and I hope this helps.
Herbus