Are crumbles a good replacement for seed?

[RohanL]

Hi guys Picasso has a good diet he eats, bean shoots, capsicum, carrots, corn, brocoli, corriander,green beans and dark leafy greens such as spinach and rocket. I also feed him Vetafarm nutriblend pellets. He has the Forege healthy seed mix ( no sun flower seeds) and crumbles also cuttlebone. He gets millet or a nut when he's a good boy or as a treat. I have to buy some more food soon and I was reading that crumbles was a healthy replacement for seed. He has always been big, not fat. Even when I first went to see the breeder he was bigger than his sibling. He is also a very active boy. I just want him to have the best diet possible. So should I get more crumbles as a replacement for seed and just use seed as a treat as well?. The seed he does have at the moment is also kept to a minimum. What do you guys feed your cockatiels?