I generally concur with the others....those plants are wilted due to lack of water. At their stage of growth, use a balanced fertilizer (I personally prefer a liquid nute) and water when the soil is dry 1-2" down inside the pot. For me (looking at your pics, my set-up is similar to yours) I water every other day. I also agree that you need bigger pots if you want any respectable yield. Even if you are only gonna grow them to 2 feet, I would put each plant in their own pot (2-3 gallon). When each plant has its own pot and doesn't have to compete with others for nutes and oxygen, they will be much happier.

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Aryan Outlaw