Aquaponics (fish + plants) is a more closed cycle, where the plants can feed the fish, and the fish byproducts can add plant nutrients to the water, if the righ

Aquaponics (fish + plants) is a more closed cycle, where the plants can feed the fish, and the fish byproducts can add plant nutrients to the water, if the right fish/plant combinations & balances are used. If this greenhouse system did not require an external nutrient supply, that would also be a noteworthy innovation. Note that people are asking if the nutrients are coming from the coconut husks, or from composting leftover tomato plant matter, specifically because it only said sun & seawater are used. Anybody who grows anything is interested in reducing inputs to their plant systems, and greater feedback interactions among their biodiversity.