Goldfish can grow even larger than that if they're cared for properly! They get to be pretty huge and they live a long time.
"But Pontos, the great sea, was father of truthful Nereus who tells no lies, eldest of his sons. They call him the Old Gentleman
because he is trustworthy, and gentle, and never forgetful of what is right, but the thoughts of his mind are mild and righteous."
Are you looking for some art of your betta? I do digital drawings for $5-10! Click here
to see some examples.