need help!

Ok so I have 2 female plants there a month and half old come to my chin beautiful lol here's the problem they looked almost like sick there droppy leafs. Basically they done look healthy and the last set of leaves on both are yellow and fallin on and so has the set above it what do I do??? I've. Fed them mircale gro nutes 1/4 the power. And the temps have been n the high 80s and 90s.....sorry camera broke no pics
 
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