If its a Aero setup, root rot is almost impossible, if setup right, like stoney said, because it is almost impossible to not have oxygen going to your roots with a Aero setup, or really any setup for that matter....even DWC you need a air stone for oxygen, and in a deep flo hydro or NFT, the air where this is no water, is your oxygen, and the only way you can ever get root rot on really any hydro system is if it dosent drain right, or you didnt set it up right to drain and turn off your hydro system and let your plants sit in 1-2 inches of water for like 3 days straight...that is also pretty unlikely, because with hydro, its constantly going or its off for a half of a day max usually.
Idk...there really isnt a way to screw up a hydro grow with the cause being root rot IMO.
But hey...I am the new guy....my info is wrong, right? lol