I have tried my parrots on many different pellets. I have a 16 year old Hahn's macaw and an 18 year old Senegal. (My grey is just a baby) I had them on Pretty Bird pellets for years. After starting my research on greys, I saw some opinions that natural pellets might be better for them. I switched them to Zupreem Natural and they took to it without any trouble. Just recently I got TOPs pellets. (I have to order those. The Zupreem are available in my local pet store.) I put some of those in their bowls. The Senegal seems to prefer them. I'm not sure if it's the taste or the size of the pellets. The Zupreem pellets I have for him are small balls (for lack of a better description) while the TOPs are small tubes. He can hold them in his foot and I think he likes that. The macaw still prefers the Zupreem (larger, oval pellets) If you are able, I would suggest trying some different types and see if Nikki might find one she likes.