Raw peanuts out of shell. I loved to watch mine turn them in their mouths over and over until it was gone. Fresh cherries with a slit or hole cut in them. My pacus ran from the cherries. As soon as I cut the slit, they waited 6 seconds and each one took one down under the driftwood. Of course the cherries were stripped in no time. Bananas were not a favorite. They ate soft pears too. Keep trying various fruits and vegetables.