ROFL. First, my system is a heart-attack inducing excuse for a freakout from both aquaponics and hydroponics purists. Both scream that 1) I'm doing it all wrong, 2) that it's neither hydroponics or aquaponics, and 3) that it will never work. So I call it hydroponics, blah, blah, blah...
My system is four linked ibc totes. A pump takes water from the lowest tank to the highest, everything else is gravity feed.
At the moment I have only minnows, since I do absolutely nothng with the system except add water and food. No temperature control, so most "food" fish are out. Mollies loved it but died at 55 degrees.
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The minnows find it perfectly congenial and breed like crazy.
The duckweed is an additional protein source for my chickens, as are any extra minnows. There is no duckweed in the higher tanks because the fish eat it too fast for a population to get established.
The two additional tanks visible in the back are water catchment for the system.