1. Scavenger: Lanshou fish tank can be cleaned by scavenger. They are gentle in character, strong in cleaning ability and similar in size to Lanshou fish. Moreover, they are often adsorbed on the cylinder wall, so they will not conflict with the orchid fish in general.

2. Mouse fish: This fish is a small tropical fish and needs water temperature above 23 ℃. Although they have requirements for water temperature, they have strong adaptability to the environment, and their ability to clean up moss and algae in fish tanks is also strong.

3, smooth sailing fish: The scientific name of smooth sailing fish is cochineal fish, which is a fish living at the bottom. Their environmental requirements are similar to those of Lanshou, and they usually eat some residual food at the bottom. It is also very suitable to raise with Lanshou goldfish.

Lanshou goldfish is gentle in character and clumsy in action. When choosing mixed fish, you should choose fish with the same size and docile character. More suitable is the butterfly tail fish in goldfish, which is the same size as Lanshou, and has a very gentle character, so it will not conflict with Lanshou. There is also the lion-headed goldfish, which is similar to Lanshou goldfish in character and clumsy in action, and is also very suitable for polyculture.