Rainbow Chip Exotic Genetix

The brown markings that you are referring to are due to a calcium deficiency. Which is also why you've noticed the slow development of the flower sites, this is also from lack of calcium. I would just up the dosage of CaMg+ that you're giving them to fix the issue. Good Luck with the rest of your journey!!!

Hey friend so as you have even noticed your self the problem is localized to where your are exausting your air into the vegetative tent to utilize all available resources . That stale air coming in and the heat will cause what looks like like heat issues or even a deficiency like cal mag which you haven't added yet . If you can have the air moved in just not direct on top of plants may help ... Do your cal mag and move that air exchange a bit and it should help ,I don't believe it's rust fungus but lower humidity would help eliminate that possibility in the future ...cheers and good luck brother ..

I think it’s a calcium or magnesium problem. Adding some Calmag will do no harm. Good luck 👍🏽🍀