KOOS

Hallo, i'm am totally new in the African Grey pet field, but i am so proud and happy to have one. My parrot is a "sweety", besides the fact that he/she (how would i know?) get aggresive when i stop playing with him/her. I'm sure i will be able to solve that problem. I do have a question i would like to ask you though and that is that i'm a bit worried about the colour of my parrot. It was a "normal" grey colour when i bought it, but now it seems to me that the grey fade, as well as the red of the tail. Could that be a diet problem (i feed him "Marlton's gourmet parrot food and Brenco's new generation parrot mix, as well as parrot treats and fruit.)