Breadcrumbs, algae, roots, leaves and fragments of aquatic plants, floating lotus, water hyacinth, Malayan eye, green peppercorns and bitter grass, earthworms, aquatic insects, eggs, chrysalides, snails, mussels, and fish, etc., in a word, meat and vegetables eat all.
If you are keeping it for fun it is recommended to change the water three days or it will hang up.