Some sort of deficiency?

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Hey guys, this is my Gorilla Glue autoflower a couple weeks into flower. The past couple days I’ve noticed some changes in the coloring of the leaves. I started my first feeding last week with Foxfarm Big Bloom and Grow Big about 1/3 of the normal dosage. I was thinking spider mites but I’ve throughly looked through the leaves with a loupe and couldn’t find a single mite, larve, or webbing of any kind. They also get a been treatment about once a week so I’m skeptical of that. I’m running on 300 watt LEDs. My soil is a 70% FFOF and 30% perlite grown in 3 gallon pots. Run off Ph is about 6.7. 18/6 light cycle watered about twice a week until minimal run off. Any ideas? It should be noted the pictures were taken about an hour before lights out which I’m sure adds to the droop. They haven’t been like that the past couple days.
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They don.t look that bad to me but i would up feed dose to half rcommended dose.Also you should be using cal/mag with your feeding .
i'm gonna grab some cal mag today. i've been using dechlorinated tap so i thought i might be able to get away with out the calmag. thanks for the quick response!
 
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