Chicken actually contains way more fat than is possible for these guys to digest and also could contain less nutritional value than 90% of the other possible foods there are to feed your RTC. Nothing beats other fish meat, Mine personally loves Shrimp, Killie Fish, Muscles, Sardines get his attention quick! and any cheap raw fish from the market really Also you should make sure you try to feed it some fruits from time to time as they will eat it in the wild and helps ensure that they are getting everything they need as far as vitamins go.
Awsome RTC you have there, keep feeding him right and he'll stay that way