I did see that you had an aeroponics set-up, I'm not familiar with that particular one. Even with a lot of roots in the air I always liked to aerate the rez and underneath each plant (10" airstones) with big honk'in air pump, I also used to titrate (slow feed) some hydrogen peroxide (40%) into my system but I don't know if anyone does that kind of thing anymore. Just because I used to do it doesn't mean it has any value nowadays. Every system has its ins/outs as to benefits versus cost versus yield etc.