Yellow nodes

Jungleboy#1

New Member
Got 1 lemon auto and 1 gelato x og Kush fem suffering from yellow nodes and stunted growth. Some leaves have started to turn yellow to.
There is also 9 healthy gelato x og Kush in the same room, medium, and feed.
unsure of the problem all in soil same 600w light, ph water at 6.0. any ideas whats going wrong with these two. Also a phot of the healthy gelato in the sameroom to compare to.
The gelato in question is the smaller plant with yellow nodes and the lemon is the larger plant with yellow nodes.
 

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