Firstly, can I say Alex's are awesome birdies. I may be bias but I think they are wonderful.
Bundii gets two sized pellets from Vetafarm as this is what is available locally. They have a new one out here that smells like blueberries and she seems to like it best. She has a dish with pellets, small amount of good quality bird seed and some mixed nuts available at all times. In the afternoon, she gets a mix of fruits and veggies. This includes whatever is in the house, corn (personal favourite), Apple, celery, beet root, grapes, berries, etc. pretty much anything apart from onion, garlic, avocado - these are toxic to birds.
Her cage is the biggest I could get with the appropriate bar spacing. She is often in the cage all day while I am at work so the bigger space is good for more toys etc to keep her busy.
Toys - as Trish said anything they can chew. They are BIG chewers. That big red beak needs to keep busy. Bundii always has a combination of toys available, including hardwood types, natural pods and branches, simple paddle pop stick types, etc, for some days she feels like just chewing the soft stuff and she can create a bigger mess. We also give her the junk mail as she likes to destroy this as well.
I too can vouch for the powerful red beak. I won't lie - it hurts like the dickens. You just have to learnt the signs of a birdie about to bite and learnt from that. Over time, she will get better. I am not Bundii's favourite person, that would be my hubby but we are working on her tolerating me more.
They are smart and extremely intelligent birds and you would not be disappointed in adopting one of them. If you have any other questions, please don't hesitate to ask. We are here to help.