First Ever Grow - Gorilla Glue Auto

high_times Sorry these girls are going up late. They are two days into the second week of flower at day 37. This is my first grow with 6 plants. 3 Gorilla Glue autoflower and 3 OG Kush photoperiods. All seem to be doing well except two of my autos. I set up the nutes in all 3 pots the same way, but two of them seem stunted and one of them is also yellowing. I'm guessing one is having nutrient deficiency, but all of my research I've done I can't seem to find a definitive answer. As for watering I have been only watering when the first inch of topsoil is completely dry. I have been hesitant to deep watering and over watering them, but I've read that they require daily watering once in flower. RH has been steady at 45% RH and 75 degrees throughout the entire grow so far. Any advice on what is wrong with my yellowing auto would be much appreciated! Thank you!