AZ grower here, you should come introduce yourself in the AZ threads...Yeah dude you got nute burn.. Different strains do different things. Your fox farm soil comes " hot " with nutes in it already so that plant that looks like shit has a serious case of nute burn, basically it's over fed even though they are clones you can still give them nute burn I have done it quite a few times with Fox Farms Ocean Forest.. Also your temps are pretty high, if you have AC why are you letting it get up to 90 degrees??