Hi there, I have moved your thread to the Diet and Nutrition section where it's most appropriate.
You are on a good path regarding your budgies' diet and you can work in incorporating more fresh vegetables, leafy greens to add to the carrot.
You can also sprout seeds, budgies love this and it's an easy way to make them more receptive to fresh foods, especially if you are having problems with getting them to eat their veggies.
It's best to reduce the amount of times you offer them fruit (in this case apple) to once a week or once every two weeks depending on the type of fruit.
Since fruit is high in sugar, it's best to offer a tiny piece occasionally.
You can also give them egg food once a week or daily depending if they are moulting or having a health issue that needs a boost in nourishment.
You will find lots of good info and tips by reading the stickies on this section of the forums.