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You will get lots of different answers about defoliation. Opinions vary.
I grow in boxes, never defoliate (except for removing the odd leaf if it's shading a bud site or dying off) , and get great yields.
To me it looks like a good canopy... gaps don't make buds !
you need good ventilation and extraction.
Check some of the links in my sig for pics of 'bursting boxes' ... never caused me a mould or rot problem.
VG
it looks like everything in there has plenty of space so no need to defoliate. i'm on the side of those who think defoliation is for necessity only - usually when your humidity is staying too high and/or not enough air movement.