Why do i have some yellowing leafs

86 is a tad warm, u would focus on getting the temp down because if you don't have the nutrients dialed in. I find IMHO high temps will speed up nutrient issues. Also perhaps a tad bit if N may help. Plants still require it in flowering just not as much. CHEERS!!!

What medium are you in? If its Coco try bring your PH down a Tad. Measure your run off ppm and PH as you may be facing a lockout and adding more nutrients would make things worse.

Try adding a humidifier to your tent. A cool mist one. I have a 2x4 veg tent and when I forget to fill it the temperature rises in my tent. When I fill it back up it drops the temperature a bit. Maybe add an oscillating fan too. 86 is a bit hot. 77 would be more ideal. I also have a 4x4 flower tent and I can’t keep the doors shut when the lights are on. Also maybe try having it more open. Either that or you add an expensive AC unit. Hope that helps.