I don't know about the corn, but variety is the spice of life, so maybe you could mix some of this in with the regular 'tiel seed periodically? Along with lots of fresh stuff, we like to give the birds at work a variety of seeds and pellets. (The Ringneck 'Keets, for example, LOVE Parrotlet seed, so we mix a little bit in with their normal food about once a week.)

I LOVE making birdie 'salads' in the mornings. It's my favorite opening duty. Twice a week our bird lady goes to the grocery store across the street and gets all sorts of stuff for them! Of course, I sample almost all of it.... *laughs*