Halfmoon Betta Fish

Halfmoon Betta Fish

The Halfmoon Betta, in my opinion at least, is one of the most gorgeous long finned bettas you will ever get your hands on. When flared, it has a full 180 degree spread that is just amazing to see which makes this betta a favorite among a lot of betta enthusiasts.

Halfmoon Betta Facts

Here are some interesting tidbits about this fantastic creature:

  • The Halfmoon betta (often referred to as “HM” for short) is a domestic betta and does not exist in the wild. Breeding of this fine specimen began in the later part of the 1980s. (Click here if you are interested in a history lesson.)
  • If the breeding process is done correctly, their tail will take on the shape of the letter D (straight on one side and curved on the other). You will also notice that their dorsal and anal fins are larger than those on other fin types.
  • As you may have noticed in my “Plakat Betta” and “Double Tail Betta” posts, you will often see this betta mixed with the Plakat and Double Tail, resulting in these fine specimens:


Platinum Black Dragon Halfmoon Plakat Betta
Platinum Black Dragon Halfmoon Plakat Betta


Double Tail Halfmoon
Double Tail Halfmoon


  • Owning an Halfmoon betta requires a little bit more maintenance than other bettas. Mostly because they are not from a “natural” habitat and tend to pick up diseases more than other types, so it is important to keep a special eye on the water quality to avoid them getting sick.
  • Because of their large fins, they are prone to tail-biting and also tend to damage their fins more than other types, especially if the tank is too small. Give these little guys some room to move around (i.e.: don’t stick them in a 1-gallon aquarium) and they’ll be ok.
  • Let’s not forget about the “Over Halfmoon” (OHM). This is where the Halfmoon goes to the extreme and has a spread that is over 180 degrees when flared, as you can see below:


Hawk Red Dragon OHM
Hawk Red Dragon OHM


Copper OHM
Copper OHM


  • Some betta enthusiasts say that the Halfmoon Betta is the least aggressive betta out there. I can’t state that for a fact since I haven’t had too many bettas that have given me the “evil eye” lately, or that have been overly aggressive to my other fish, so I’ll have to take their word for it. 🙂


Halfmoon Betta In Action

Here’s a video of a beautiful Blue Butterfly Halfmoon Male Betta in action:

Blue Butterfly Big Elephant Ears Halfmoon male Betta Fish

Do you know anything else useful about the Halfmoon betta that you think I should mention? Or other fun betta fish facts? If so, please comment on my post! Also, before you leave, check out the other types of betta fish that we’ve posted about so far.


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