Round Tail Betta Fish

round tail betta fish

Betta fish come in many different variations, most boasting brilliant colors and flamboyant fins. Today, I’m going to be talking about the Round Tail Betta Fish, which are a common but beautiful type of betta. Here are some fun facts:

  • Roundtail bettas have a single tail with round edges and are sometimes referred to as fan tail betta.
  • Depending on where you buy them, you may see them listed as Single Tail (ST) instead of Round Tail.
  • Some people mistake them for delta betta fish because their tails are similar, however the delta betta has a straighter edge than the roundtail. They are also mistaken for halfmoon bettas (HM), however the HM’s tail will have a “D” shape instead. See below for the differences:


Roundtail Betta Fish
Roundtail Betta Fish


Halfmoon Betta Fish
Halfmoon Betta Fish


Male Super Delta Tail Betta
Male Super Delta Tail Betta (Straighter edges)


  • Roundtails generally have a lifespan of about 2 or 3 years. Due to their relatively short lifespan, it is best to get roundtails when they are babies. Baby roundtails will eat their yolk sacs during the first few days of their life. You can then feed them mircoworms, baby brine shrimp or liquid fry food such as Infusoria. As they get older they can eat bigger foods. Adult roundtail bettas eat live brine shrimp, flakes and pellets. Pellets are recommended instead of flakes as they make the water less dirty and it is easier to tell how much food your betta fish are eating with pellets.


  • To house your round tail betta fish you need a fish tank of adequate size. The tank should be at least 2.5 gallons but when it comes to tank size, bigger is better. Smaller tanks allow ammonia to build up if the water is not changed regularly and this can be fatal to your betta fish. Horizontal tanks are better than vertical ones. You will also need a cover or lid for your tank as round tails can jump as high as ½ foot into the air! (Haven’t seen this myself, just stating what I’ve heard.) Obviously if they jump out of the tank they can meet serious harm, so a tank cover is definitely recommended.


Round Tail Betta Fish In Action

Here’s a video of a White and Blue Round Tail Male Betta in action:

Mating of Betta Fish (White-Blue Round tail Male with a HM Blue Female)The male ate the eggs!!!

Round Tail betta fish make a beautiful addition to any aquarium but they require a lot of space, care and attention. While they prefer to swim alone they will do well if they have adequate places to hide in a large tank that is clean and has a lot of planted corners.
Do you know anything else useful about the Round Tail Betta Fish that you think I should mention? Or other fun betta fish facts? If so, please comment on my post! For information on other betta fish, visit our Featured Betta Fish Archive.


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