Can Mandarin Fish Live In Freshwater?

Can Mandarin Fish Live In Freshwater? The Crowntail Betta fish is one of the most popular small freshwater species in the US for one main reason; their beautiful caudal fins! Are mandarin fish hard to keep? Mandarinfish Profile. Fish that are members of the Callionymidae or Dragonet family are commonly called mandarinfish. These are difficult