you must focus on getting james back onto his food, feed daily with earthworms and after a few days slowly up the amount of food you offer, and after a week and a half offer twice a day, young axies must be fed daily.
I have successfully fattened up a very skinny axie using a combination of live earthworm, pellets and beef heart, but you must feed beef heart sparingly as it is very high in fat, and once at a healthy weight cut it from your animals diet completely.