leaves turning yellow

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i have 4 akr growning and 1 blue mammoth in 1 gallon pots only 2 of my youngest plants have started yellowing the other 2 akr are close to being cut.im useing foxfarm ocean forest and fox farm nutes and also adding cal/mag.lighting 180watt led from hydroponics hut and 240watt blackstar led
 

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This looks very much like light bleeching from your LED. I'm sure one of the LED growers will be along to confirm it.

153128d1355166159-leaves-turning-yellow-img_20121210_143922%5B1%5D.jpg
 
so do you think i should move led higher in air??i just recently added the blackstar 240watt led all i was using was 180watt from hydroponic hut.i thought 1 led was not enough for all my plants so i added the black star 240watt
 
Looks like bleaching to me too, bud
 
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