I have a group of 15 male budgies in a large flight cage in a tree in my garden.
They are coming up to 8 years old this year.
They are fed this diet:
seeds,
mineral blocks and cuttlebone,
raw carrots,
broccoli,
steamed sweet corn on the cob,
cabbage,
AND chicken pellets (when they are molting).
They also have fresh fruit tree branches as perches.. they like to strip off the bark and I have seen them eating that too.
They have NO grit, NO vitamins and NO processed bird pellets.
I fill the seed feeder only after they have eaten ALL the seeds. So they don't pick and choose what to eat. If the seed run out when I at work, they will eat more of the vegetables. I make sure they have a full feeder each evening so they eat before they roost.
They get to bath every few days.. and also they get a shower when the sprinklers come on.. they LOVE that.
I think the natural sunlight help them a lot too.
The only health problem I have had with them was scaly leg mites (when I first got them) I treated them myself by painting on vegetable oil over their legs and beaks.. and this cured it and it has not come back. I also lost a few birds 2 years ago when a hawk killed them through the cage bars.. but now the cage is double wired and safe.
I like to keep only male budgies, as I don't want them to breed. Also the males seem more active, playful and don't seem to get overweight as easily as females (maybe as they are always flying about chasing each other).
I never tried to tame them, but most of them got tame themselves... they will climb over my arm and hand if I put it in the cage holding some food. They like to come and nibble my nose and give me kisses through the cage bars too. They are interested in anything new.. and like to show off to each other how brave them can be.