Budgie throwing up seed

Might be your budgies having problems. The best answer is always to see a pet doctor.

But also, feeding all seeds are not supposed to be your budgie's (or most of the parrots) main diet. I recommend 80% of your budgie's food to be PELLETS, since seeds does fill your budgie up, but doesn't give nutrition to them. Also, some more vitamins and fruits should also be included in the diet!

Always feeding seeds to parrots for a long time can lead to problems such as: nutritionless, feather not as bright, not playful (sleepy) or even more severe problems. So a combination of different foods (pellets, seeds, fruit, sea shell powder, vitamin, etc) would be wonderful for your loving birds!