Minnows and Danios are some fish that can live in the same tank as Goldfish. However, it is best that no other fish are in the tank with them.
Goldfish have a certain habitat they need in order to survive. This makes pairing them with other species difficult. They cannot have the water too warm and they will eat a lot. This puts smaller fish at danger. If a fish such as a Minnow or Danio is placed in the same tank as a Goldfish, make sure it cannot fit in the bigger fish´s mouth. Goldfish can also grow a lot and they need a big tank to live comfortably. If other fish are introduced, the tank must be even larger.