I actually added in some cracked corn. I see them nibble on it. I really don't plan on adding more, as there are better things in there (Kashi, cheerios, puffed rice, other cereals, uncooked tricolor pasta.) I have decided to keep using the Mazuri blocks though. I also add in a bag of parrot food, with all of the fun dehydrated fruits, nuts, etc. that they like as well. I also add unsalted in-shell peanuts, pig feed (no antibiotics) rolled oats, a few small-sized horse treats (not alfalfa) and the high-quality dog food (brand differs.)