Need help diagnosing a problem

Digz

Member
Particulars:
Growing using Bubbleponics (DWC)
PH of the water is 6.25
Air temp is 78 - 83 degrees at all times
60% humidity
They are fed every 2 weeks

The plants lower leaves are doing 2 things that I don't think are good:
1.) They are spoting with yellow
2.) They are discolored with a darker green color

ONLY THE BOTTOM LEAVES ARE AFFECTED. Any help in diagnosing these plants would be great....thanks everyone!
 
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