Ok, I went ahead and flushed her and gave her 4-12-4.

The recommended dosage was half a capful at 1 gallon of water. I gave them a quarter of the dosage (1/2 Tbsp) and the recommended dosage of superthrive.

The plants are perking up, but it might be because of the water and not the nutes.. The healthier plant was showing signs of yellowing on the leaves before fert.

-Could this be a heat/humidity problem as well?

Unfortunately for me, my grow room stays around 80-84 during the day but goes down to low 70s at night.

I also wanted to ask do you think they need bigger pots? I don't know the signs of being rootbound.