Harrison's is one of the best food's available, not a single one of our fids will eat it. Your bird needs certain nutrients that can come from many different foods, pellets, seeds, veggies, chicken turkey and fish,eggs, pasta, grains and legumes etc, and each of these foods supply some of these needs in various amounts, so, it's not "what one food is best,
but what combination?". Take a look at "Bird Food" to see what others feed there's...Sunflower seeds in moderation is great for our birds, the same with a little corn, it's fun to watch our baby's eat a slice of lightly cooked corn on the cob!!!
Jay