Try some radicchio, green leaf, romaine, and dandy lion leaves from your local grocery store. I got my RT from PetSmart 5 years ago and it took a little while for him to adjust to a better diet than what they gave him at the store. He loves the radicchio. Like others have mentioned, he will eat eventually. Kale is good also. You just have to try a few different ones to see what he ends up liking.