Wow well im at a lose then man that sucks but humidity is to high thats probably not the problem but when.its that high the roots dont grow cuz the leaves take in the air idk tho maybe ur plants are root bound or something i hope u figure it out i seen ur pinkish purple stem that happened to me when i.didnt have enough good air flow but as u said that fine id google it bro like alot read a bunch of different stuff and decide for.urself