Make sure you mix in a pellet or two inbetween a couple of crickets. Make sure you make the crickets splash the water on entry, and try taking of their back legs so they dont move around too much when they are in the water, that way when the pellets splash down, your fish will think it is a cricket, even though it isn't moving. Also make sure to stretch out your feedings so he/she is good and hungry. Eventually you should be able to reduce the number of crickets and increase the number of pellets, then go strictly to pellets only. It will take time, but it can be done.