dude..... those plants are underwatered severly.... you need to filll that res more (till the water hits the nets pots almost for now... (drop water level as roots grow.)

you dont need a fogger.. lose it as its a very advanced form of hydro. (because it atomizes water and air much better .. nute feeding must be on par and perfect or you will swing those plants to death.)

set your thing up as a DWC unit with airpump for aeration. that growth is just makin me sad..