Types of Betta Fish: Every Tail Shape Explained

Published: 2026-10-22 · FishyKart Blog

Betta types are named mainly by tail shape, with colour and pattern (like Koi) layered on independently - much the same relationship as tail shape and colour in fancy Guppies. Sorting out the tail-shape names first makes every other Betta description easier to parse.

Halfmoon Betta splendens with fully spread tail

Photo: Lerdsuwa - Wikimedia Commons, CC BY-SA 3.0

Tail Types

  • Veiltail - long, trailing tail that droops downward; the most common, easiest-to-find fancy type
  • Halfmoon - tail spreads to a full half-circle (180°) when flared
  • Crowntail - reduced webbing between fin rays gives a spiky, crown-like edge
  • Delta / Super Delta - tail spreads close to Halfmoon's 180° but not quite as wide
  • Double Tail - the caudal fin is split into two lobes
  • Elephant Ear (Dumbo) - oversized pectoral fins resembling ears, layered on top of any tail type
  • Plakat - short-finned, closer to the wild-type body; hardier and less fin-rot-prone

Colour Is a Separate Layer

Koi (a mottled, Koi-carp-like pattern), solid colours, and marble patterns can all appear on any of the tail types above - a "Koi Halfmoon" and a "Koi Plakat" share the same colour pattern on two entirely different fin shapes. Treat tail shape and colour as two independent choices, not a single combined category.

Which Type Is Easiest to Keep?

Plakat, by a clear margin - the short fins are less prone to fin rot (see the fin rot guide) and don't create the same swimming handicap as a large flowing Halfmoon or Veiltail. Fancy long-finned types are still very keepable, just with a bit more attention to water quality.

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Frequently Asked Questions

What is a Halfmoon Betta?

A Betta whose tail spreads to form a half-circle (180 degrees) when fully flared - one of the most popular tail types in the hobby.

What is a Plakat Betta?

A short-finned Betta, closer to the wild-type body shape, generally hardier and less prone to fin damage than long-finned fancy types.

Is Koi Betta a tail type?

No - Koi refers to a colour/pattern (a mottled, Koi-carp-like pattern), which can appear on top of almost any tail type, the same way colour and tail shape are independent traits in Guppies.

Which Betta tail type is easiest to care for?

Plakat, due to its shorter fins being less prone to fin rot and less of a swimming handicap than the large flowing tails on fancy types.

What's the difference between Crowntail and Halfmoon?

Crowntail has reduced webbing between the fin rays, giving a spiky, crown-like edge; Halfmoon has full webbing forming a smooth half-circle. Both can otherwise share similar colours and patterns.