Hi, just found this on the net
'Care and Feeding:
In the wild, Fly River Turtles feed almost exclusively on plants and fruit, with only a small part of their diet made up of snails, insects, and small fish (Ernst and Barbour, 1989). Therefore, they will do best in captivity if fed a diet that is plant-based while foods that are high in protein and fat should be avoided. Offer low protein aquatic turtle foods, such as Reptomin® or spirulina wafers. Some of their favorite foods are water lettuce, water hyacinth, watercress, duckweed, and Vallisneria, a common aquarium plant.'