All plats are different man, like humans. U gotta feel out each little guy and water them to the amount they look like they need, lift the pots everyday and feel the weight of the pot, if it's still somewhat heavy, don't even think about watering until u can pick up that pot with one hand, that's when it's dry enough to water, but from the looks of it, it's not watered enough or the roots aren't getting to the water. I only grow in ffof mixed with fflw so that's why I want to help, I don't really see too many ppl growing in ffof that much, let alone in soil for that matter, so us soil guys gotta keep together hahaha but basically I have the exact same setup, same soil, temp never goes above 87 for me and watering schedule is the same, and from my experience, it looks like there's not enough water getting to him