Ultrasonic aeroponics with GH lucas formula newbee

hello kinda new to growing, totally new to hydro/aeroponics. i am running GH micro and bloom at a 0-6.75-12= %75 of 0-8-16 @350ppm @.7CF.(442). it is dispensed to the roots through an ultrasonic humidifier. anyone growing in a simular environment? i am using 24" of air stones in around 4" of nute water in bottom of three plant tote 16"x14"x12". my question is can the longer roots sit in the bottom of the 4"? or should i elevate them to be totally suspended in the fog? any help is appreciated.
 
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