>>626951Depends on your balance of fish and plants. Too many plants, and the fish don't produce enough emulsion to feed the garden, too many fish, and there isn't enough plants to filter out the emulsion and the fish literally choke on their own shit.
As far as how long it'll last, indefinitely. But you do have to feed the fish, and maintain the tank and whatnot. Its not free food.
I had a similar design I wanted to do. A food hopper on top, feeding chickens in the coop. Any dropped seed, as well as chicken manure would fall into a worm bin below that I would also use for composting. The well-Fed worms, as the population grew, would hop out of the suspended worm bin, falling into the 550 gallon in-ground tank, feeding the fish. Then the fish emulsion would be used to grow corn, soy and pumpkin which would be used to feed the chickens and fish. The nitrogen surplus provided by the soy helps to feed the corn and pumpkin, plus vegetables get most of their energy from sunlight, so at least in theory, it should be possible to get a few eggs each day and a couple of fish a week as surplus calories without reducing the efficiency of the system as a whole.
