Weird spots on the leaves this morning

Hello!

Woke up this morning with one of the ladies having these little concaved spots on her! They were all fine yesterday

Setup:
4x4 tent
4x northern lights autoflowers
350w bloom plus LED @ 30” away from the ladies
Royal Gold coco coir with perlite
Feeding them with Green Planet Medi 1 Step 1.1 EC every day
5G air pots
Temps running from 74-78
Humidity around 30-40% ( low humidity issues )
Humidifier
Light flush 2 days ago due to nute lock.
Put down the light intensity on the LED yesterday due to stress

This is my first grow and I’m at day 17 from seed. Thank you for the input in advance and I take criticism pretty well so be straight with me!
 

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