This yellowing doesn't make sense

I put this in the wrong category originally. Please look at this and advise me on my problem. 8 clones, identical conditions, 6 yellowing - 2 not.

http://boards.cannabis.com/showthread.php?t=65920

Are you growing in individual pots..?

They all had the same mother?

The plants look normal and very nice...
They are shiny suckkers.. like you sprayed wax on them or something..

It does look like you may have over fed a tiny bit..

congrats on a nice harvest to come...

Individual pots but 1 nute reservior for all.
Same mother, that's what's confusing.
Not sprayed with anything, is shiney bad at all?
Overfed? I use half the recommended dose, maybe I should cut back a little more.