Plant Problems...go figure

2 of my mothers leaves started to wilt over. One of them is in soil and the other is a DWC. The top of the soil plants leaves have started to turn a lighter color green in some areas in addition to them wilting. The DWC plants leaves are just wilting, no discoloration yet. Could this be from an imbalance of ph? I'm thinking not because my other mothers are looking just fine and have been fed exactly the same way. All of my mothers have been doing great for the last 50 days or so. I'm thinking its some kind of nutrient diffency but I'm not sure what. I tried to take a pic of each plant but my camera is dead....never buy a camera that has a rechargeable battery! I'll post some as soon as it charges up. Any takers on what they could be lacking?
 
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