Mix some of the current food it is eating with the food you want it to eat. If it has more of a mixture, it will be more likely to try some of the new food. And then you can wean it off the rice.Thank you everyone for your valuable opinions. I already give niacin sometime. Should I add niacin with the water always? Today I have brought corn and a soya chunk. I am trying with corn today first, let see how it goes.