Thank you for your comment on my post!
With the fish in the tank, you would not use fertilizers, that could possibly harm the fish. The idea is to just use the nutrients produced by the fish.
I have not figured out a good ratio of fish to plants yet, but I do know that I need more fish in the tank than I had. The number of fish in the tank also depends on the size of the fish. Larger fish would produce more waste for the plants to use, so you wouldn't need as many.
These floating plants are called water lettuce by the places that sell them. I don't know if the plant is edible.
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Now I learned something new that fishes alone can supply nutrients for plants. That is a very good way to re-use waste into something beneficial.
Thank you for all the clarifications! 😊