The gouldian’s primary food is seed (various millet and niger seeds).
There are many mix seed dishes you can try one of them or can try one by one all.
like here some experts use the mixture of White Proso Millet, Canary Grass Seed, Japanese Millet
Some exports use White Yellow Millet, Canary Grass Seed
and some experts use only yellow Millet and Orange Millet and Cheena.