Help needed with pics!!

so here a pics of the plants. I use jungle juice micro-grow-bloom 4ml/l. PH of water is 6.5. and i always boil it and let it cool before i use it.
I use CO2 (the yeast method) and i fliped it to 12/12 8 days ago. And yellow and brown is starting to show on the bottom leaves. What to do? Plz help.
I use soil (a light mix) and the PH is 6.5. My temps are a little hot, 89 - 91 degrees F. But i read that this was okay as long co2 was induced.

Bummer. was rly hoping for some input. But i guess no one knows whats is up with this? If more info is needed just let me know. I somewhat fixed the heating issue yesterday, and its now pretty stable at 86-87 degrees F.