Name my problem! First Grow. Help would be appreciated

Here is a pic of one of the bad fan leaves. Im pretty sure this has to do with my very low soil ph. I checked my other ones runoff and it was 4.8! No idea since i used FFOF and ph my h2o to 6.5-6.8..Im guessing FFOF has a low PH. Anyone have experience w that and how to fix it?! Also I need to know what other issues you think i might have. temp goes from 70-85. Maybe a little too hot as well? Thanks in advance

You might need to get some pH up unless the water you give it is high like over 7.0. If it is you can flush it until it gets to 6.5 or so. Thats your priority because it must be locking out something.

Ya i do PH my water. Can I flush it with around say 9 or 10 PH to speed up the process or will that not be a good idea? As long as it ends up 6.5-6.8 I should be good right? Do you think 85 is too hot? Thanks for info!

Yes the higher it is the faster it will go. Whatever it takes to get it between 6.2-6.8. 85 is getting a bit hot. Every strain seems different though. Indicas seem to be a little more heat resistant I think it is.