I guess it doesn't, I would have thought that someone wanting an animal like that they would know something about the diet. a quick google told me this Diet: Juvenile land mullets eat mostly insects and other invertebrates. As they mature, more and more vegetable matter is consumed until, as adults, around 80% of the diet consists of fallen berries and fruits, new leaves and flowers.
taken from here- Land Mullet -Australian Reptile Park Animals