I've been making my own seed mix for a while now, containing 1/2 lb. millet, 1/2 lb quinoa, 1 c hemp seeds, 1 c chia seeds, 1/2 c flax seeds, 1 c oat groats, and 1 c rolled oats. But, my budgies only eat the millet, oat groats, and rolled oats. So, I want to switch out the quinoa, hemp seeds, chia seeds, and flax seeds with other seeds they might like. What might be some good, healthy replacements?