How big do fine tales fish get?

Fintail fish, commonly known as Fintails or Fintail Goldfish, can vary in size depending on the specific species, but many can grow to be around 6 to 8 inches long. Some larger varieties may reach up to 12 inches or more under optimal care. Proper tank size and water quality can influence their growth potential, so providing a suitable environment is essential for their development.