Yellow leaves in my Aquaponics

Iron deficiency is one of the most common deficiencies in an aquaponics garden, it is responsible for the yellowing of plant leaves. Furtunately, this Iron deficiency is also one of the easiest problems to fix: simply adding a small amount of Chelated Iron fertilizer at regular intervals is all that is needed.
Iron deficiency in an aquaponics garden is quite common. In aquaponics, unless you add additional sources for the nutrients, all nutrients that come into the system will come through the fish food. Not all trace elements are introduced in the fish food.