I got some yellowing on some leaves do you guys know whats wrong?

So I got some yellowing on one plant(one leaf) and some taco leaves on my other plant( most large leaves). It's my first time growing and so far everything has been going good till the taco leaves started 2 weeks ago. I got 2 plants growing in a 2x4x5 tent. I'm using a mars hydro tsl2000 at full power and it's about 18 inches away from canopy. My temperatures have been around 75-82 and humidity has been kinda high at 50-60 %, I got a dehumidifier today so I hope it brings it down to 40-50%. I got plenty of air flow with 2 small hurricane clip fans and another small oscillating on the floor. I'm growing in coco using emerald harvest nutrients and following their feeding schedule accordingly. A use ro water and ph 5.8-6.2. My plants are in day 44 of flower, I have Runtz and Forbidden Runtz by @purplecitygenetics . The temperatures were pretty high at 78-85 3 weeks ago till I got my ac. What do taco leaves mean and what do you guys think this yellowing is??? Thanks, yall the best.

More nug shots

That looks to me like stress from the light being too close. It's hard to flower in a 5 foot tent, I would raise the light if possible and try to get a taller tent for next time. Good luck!