Soil welcome !
That is a nice system you have built.
You might enjoy this thread: Planted HOB thread.
Many of the members on that thread have created similar tanks on a smaller scale.
Your system and the the members on the Planted HOB thread are growing plants in an aquaponic method.
These two links are to a more traditional Aquaponic method. The 1st is true to the original meaning of Aquaponics. In this system the vegitables are food crop and the Fish eventually will also be food.
Nalu's IBC and shelve Aquaponics.
In the 2nd , my tank, the vegitables will be eaten, but not the fish.
Aquaponics for Vegans/Anubias Farm