2021/08/12 · The Diet Difference. Pangasius: They are omnivores and eat all kinds of live, fresh, flake foods. They eat brine shrimp, blood worms, live crickets, and worms. However, as they grow older, they lose their teeth and tend to become more herbivores. Tilapia: They have the eating habits of a herbivore. They eat algae, which they filter through the