drooping during the day

How's it going people. I have 5 clones of some random Bush weed all female, been in Veg for 3 weeks under 400w hps with 175 cfm exhaust fan with a portable ac for temp control.nutes are all advance nutrients and temps rang from 69-76. My issue is at night leaves are perky and during the day they sagg, other than that they are healthy, I'll post pictures later Any thoughts?
 
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