Thomas - don't stress - you just have to do it gradually. He is still young so he might come round quite quickly

With my 2 I give them a finger of wholemeal seeded toast with palm oil in the morning. While they munch that I sort out their bowls. They get a mix of pellets - Harrisons, TOPS and hagens (if I have all 3). Along with that they get a mixture of fresh veg (eg pepper, carrot, cabbage, kale, courgette, cucumber etc) and some fruit (eg orange, apple, cherry, blueberry etc). They also get a nut or 2.
They also have fresh water.
They have this through the day as we are out at work.
When I come home they get either sprout mix or pulses and pasta mix with a veg mash and a couple of Harrison's power treats.
When they go back in their cage at night they have their pellets back as they usually have a munch before cover up. I sometimes give them a little seed mix instead as a treat - it's the Prestige Amazon mix as it's low in sunflower content

If I were you I would try the pellets as with the vitamins it can be easy to overdose without knowing or possibly not give enough. At least with pellets you know they are getting all of the vitamins and minerals they need alongside a variety of other foods

If I can convert an 11 year old stubborn grey I'm sure you'll do fine with Gonzo
