Yellowing leaves/ not yellow, but not green?

Coors

Well-Known Member
So over all my plant friends are stokes in there new environment, they are growing with short intervals between there nodes, they have a sturdy base, the temp is around 72-74 the humidity is around 60%, and my PH is around 6.6, the plant are under 2 400wt MH that are about 12-18" away from the plants with a fan blowing on them all, they are about 4 weeks old (Total after cloning) they are on a 24HR light cycle soon to change to 18/6. They are in 16 oz keg cups with holes melted into in the bottom. This is my first time starting from clones.

Here is the problem. my plants (AK-47) are kind of a pale green. And there is some decolorization originating from the middle (main middle vain) of the lower leaves. I can't tell if it is a burn or a deficiency? Can anybody help???

Should I flush, or add more nutes??
 
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