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Types of killifish

5 killifish compared at one scale: adult size, the tank they need, temperature and group size.

American flagfishAmerican flagfishClown killifishClown killifishGardneri killifishGardneri killifish

5 species

Scroll sideways to see them all. All drawn at one scale, adult size: = 1 inch. Tap one to open its care page.
American flagfish

American flagfish

Semi-aggressive · Middle · easy care

  • 2.5 in adult
  • 20+ gal
  • 65–79 °F
  • pH 6.5 to 8.5
  • alone or pair
Clown killifish

Clown killifish

Peaceful · Top · moderate care

  • 1.4 in adult
  • 5+ gal
  • 72–80 °F
  • pH 5.5 to 7
  • groups of 4+
Gardneri killifish

Gardneri killifish

Semi-aggressive · Top · easy care

  • 2.6 in adult
  • 10+ gal
  • 72–79 °F
  • pH 6 to 7.5
  • groups of 3+
Lyretail killifish

Lyretail killifish

Peaceful · Top · moderate care

  • 2.4 in adult
  • 10+ gal
  • 70–79 °F
  • pH 5.5 to 7
  • groups of 3+

Other fish families

Types of plecosTypes of aquarium shrimpTypes of aquarium snailsTypes of tetrasTypes of rasboras and daniosTypes of barbsTypes of livebearersTypes of bettas and gouramisTypes of cichlidsTypes of catfishTypes of loachesTypes of freshwater sharksTypes of rainbowfishTypes of puffersTypes of goldfishTypes of oddball fishTypes of shrimp, snails, frogs and axolotlsAll fish

Names, and adult sizes where the article gives one, are checked against Wikipedia; care ranges are common hobby guidance, and each species page says which is which. 5 of these 5 are fish. Photos are real photographs from Wikimedia Commons, credited below; the lineup is our own drawing at one scale.

Photo credits

Real photographs from Wikimedia Commons, resized and cropped to fit; each is used under the license named.