Please help diagnose what’s up with my plant

Current set up
8 inch outtake fan
6 inch inline fan
Coco perlight 70/30
Flora trio
Week 7
Under 600w hps currently down to 400w due to heat
Ph to usually 6.5
Current run off is around 6.2 / 5.7 different plant

Some leaves are very dark others quite light and turning yellow
 

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