Jumping in a little late so forgive me if I’m behind. I would suggest flowering them now at that size. Having that many plants share root space generally isn’t a good idea. You’ll find some roots grow quicker than others and they’ll end up stunting the rest of the plants. Sometimes, those plants are males... so you’ll end up having a big male and small females. I always recommend giving plants their own container. Even if the container is smaller like a solo cup (16oz beer cup with 4 small holes burnt in the bottom before adding soil. And rinse it out with water after burning the holes just to make sure you get rid of chemicals that may have gone into the cup). Reason I suggest flowering them now is bc mainly the light source will not be enough to cover all those plants if they get too big. For your first grow they look great regarding to feeding. I’m a big fan of brewing my own organic teas with an air stone in a bucket/Rubbermaid filled with water (aerate for a day or so if using tap to help bubble the chlorine out) then add amendments like Alfalfa meal, liquid kelp or kelp meal, molasses, bat guano (Mexican for veg, Indonesian for early flower and transitional, Jamaican for peak flowering). Hoping more than anything your bagseed came from a plant pollinated by a male instead of a hermaphrodite which have higher chances of producing herm offspring. Other than that, really looking good for your first grow. As for the white spots on the leaves, that looks like light bleaching from the plants being too close to the light. Stressors like this, Lights on in the dark peroid, pests, nutrient burn, and countless other things are other variables that can cause hermaphroditism as well.
Keep up the good work and don’t hesitate to ask us anything. Take any attitude you get here with a grain of salt and don’t let it discourage you. We’re all here for the same reason which is to bask in the joys of growing cannabis by sharing and learning with and from each other.
Cheers and have a great week
Edit: those yellow sticky traps are great for gnats. I suggest hanging a few around your grow. Natures Good Guys sells lady bugs and other pest munching predators. They have a shop on amazon as well