help with this please

ive got a flood and drain system running but the way its made it dont drain fully and leaves bout an inch at the bottom now the plants roots are always in the water and nut solution only long roots are in half are out is this ok as dont they need air

if only some of the roots are submerged.......
they need air.
time for bubbles

Bubbles and a little H2O2 work well to deliver quick oxygen.

Can't leave roots sitting in still water, they'll rot!