I am getting mixed answers. Some people tell me this is very healthy for a

other people tell me not to touch it with a 10 foot pole. Right now this is my

diet, i am TRYING to get him to try fruits/vegetables but he literally won't go near his food bowl if anything but this is in it. including spray millet. I feel as though I am harming my bird due to mixed answers. I adopted him, and he is 6 y/o as far as i understand this is all the previous owner used to feed him. no veg, no fruits so maybe that's why he wont eat them? He runs to the opposite side of the cage if i put anything in his bowl but
http://www.amazon.com/Kaytee-Fiesta-Food-Cockatiel-2-Pound/dp/B000FXR532/ref=pd_bxgy_petsupplies_img_y please help me feed my feathered friend better foods!
edit: i have also had a cuttlebone in his cage for almost a month now and it has remained untouched.