@Silky_smooth, have the same kind of setup on one of her diary or too so I recommending you to take a look and well copy what she's doing has she's doing it well. That said if the roots doesn't touch the water you can bring more water or put a cotton mesh , like that the water will travel trought the mesh and will reach the roots , google it , if I remember well they are doing it with dutch pots or NFT system ( I'm not sure )