Not sure what's up with this plant?

[Budwulf]

Hello friends

I need a little help identifying the problem with this plant. It's the only one of 4 displaying this. Is it a pest? For these particular plants I used a mix of Fox Farm Ocean Forest/Happy Frog, so there's a chance something was riding in the bag. Environment is decent. Maybe a touch high on humidity for preflowering, hovering between 80-85 RH, brought it down to 75. My temps are in the low 80s in the day and mid to low 70s at night. It's hard to see in the photo but some of new leaf tips are dead, or withered away. I use organic amendments only, so no bottles touch my soil.

 

[Manidoo]

Hot soil and drying out too much would be my diagnosis upon just looking over the limited info and photos..

 

[Buzzer777]

Is your PH ok?

 

[Manidoo]

With hot soils and bottles that drought will make the pH drop indeed ? EC goes up too even in organic and I think it's all this is

 

[Budwulf]

No bottles in use. Twas the heat and excessive humidity. Normal growth has resumed.