Contact Purina and they will discuss sizes with you. However, I'm not sure size matters that much. As it softens in the water, they keep nibbling at it. I believe they get all they need. They must. Fatheads and baby bluegills go nuts for regular size feed.
Of course, it could be an advantage to have the real small stuff. They make everything from dust to chunks. I doubt that your local feed store will have what you want and fewer and fewer are carrying Purina products. However, I've never found a feed store that wasn't doing some business with Purina. I have had them special order what I want. No problem.
