Help please

I am running a DWC - Aero system, so all plant use the same res. Could anyone tell me why the 1 plant is showing what ever it is and the others look good ? This is lowryder 2.
 
If the roots are all hanging in the same res why would 1 plant have 8 fan leaves showing the effects and the other plants are showing no signs of it ?
 
Anyone else have any ideas what this could be. Still no sign of it on the other plants.
 
Still just the one plant showing signs of this, I am sitting at 280 ppm and right and in between 5.5 and 6 on PH.
 
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