Aquaponics is a pain in the everlovin' ASS. I've done it professionally with food crops... fish plus plants equals a lot of money spent purifying water and scouring around for low-salt fish feed. What you describe is not aquaponics.

Aeroponics has roots suspended in a mist chamber in the dark.

Ebb n Flow aka Flood n Drain has periodic flood cycles that flood only the ROOTS of the plants.

DWC has roots in a bucket in the dark with LOTS of oxygen being bubbled through it... the opposite of aeroponics.

Under no circumstances should the plants be subjected to long periods of total immersion, as it suffocates them.