Hello and welcome.
Fiddlejen makes excellent points and questions, more details and information will help us help you.
To post a picture the quick way is to click go advanced button under tge text bix, then hut paperclip. Choose a picture, on tge far rightvus a button that says upload click that then close the window and post the text. Picture will attach underneath.
My parakeets have free choice seed mix, free choice pellets and twice daily get leafy greens like romaine, bok choy, Swiss chard, abd I offer bell pepper, peas, green beans, broccoli, cucumber, zucchini, snap peas, green beans. I offer just a few of those each day, and rotate what I offer, sometimes they get strawberries, cranberry, black berries. They have a cuttlebone, and mineral block.
My budgies have never over eaten with free choice. Budgies are prone to fatty tumors thst are called Lipoma , not cancer tho.