if it is mouthing the food dont worry about changing it, he will get a little hungrier and decide when he gets it in his mouth to swallow it. he looks to be healthy so if he is mouthing just hold out another day or two and he will eat the pellets. if he doesnt try a little smelt, or raw shrimp just tear it up into itty bitty pieces. its the only thing my juvi tsn will eat.