Betta fish food or other types of tropical fish food are suitable for feeding goldfish. The difference between these types of goldfish flakes is that the tropical type is made for warmer waters and colder waters. This results a variance of protein that is included. When fish live in warmer waters, they are far more capable of digesting higher amounts of protein. Given that most of us live in warm houses that naturally keep our goldfish tanks at higher temperatures, Betta fish food is therefore suitable for use as fish food for goldfish.\r