Mustard Betta Fish (Images & Care Guide)

Estimated read time 10 min read

This is the most detailed care guide on the Mustard Gas Betta online.

In this guide, you’ll learn;

  • What is a Mustard Gas Betta, and where it’s from
  • Care requirements
  • Growth rate & Lifespan
  • Tail types & Colouring
  • Mustard Gas Betta pictures
  • Where to buy them

Let’s begin.

What Is A Mustard Gas Betta?

A Mustard Gas Betta is a rare, bi-colored (or in some cases multi-colored) species of the Betta, also called the Siamese fighting fish. The fishing world first came to know about the fish in 1999. A US breeder named Jude Al (confirmed by multiple sources, and here is the oldest one) introduced this fish to the aquarists, and his fish was supposed to be the “purest” stock of the bunch. But, unfortunately, most Mustard Gas Bettas are now either imitation or produced by cross-breeding.

The successful breeding of Mustard Gas took 13 years. Nowadays, the fish is primarily bred in South East Asia, and most aquarists believe that the current stock has diluted far away from the original version. Still, a Mustard Gas Betta is entirely different even by typical Betta beauty standards.

There is just one bone that everyone wants to pick with Jude Al, and it’s the name. Why he gave such a destructive, death-ridden, and ugly (history of Mustard Gas) name to something so beautiful is beyond us. But it makes a twisted sense if you consider the beautiful mustard color that spreads out to the half-moon tail from the blue-green body. Still, nobody has tried to rename the fish and respected the naming sense of the original breeder.

Unveil the secrets to providing exceptional care for your veiltail Betta male. Learn the specialized techniques and ensure a thriving, vibrant life for your beloved aquatic companion.

Care Requirements

The Betta, like most others, is not very demanding, as seen by its humble care requirements below.

  • Min Tank Size: 5 Gallons
  • Temperature: 72°- 82° F (22.2° – 27.8° C)
  • pH: 6.0 – 7.5
  • KH: 2 – 12 dKH

Though many aquarists have found their Mustard Gas (MG) Betta thriving in smaller tanks, we wouldn’t recommend it without a filter.

Further Reading: How big should a Betta Tank be?


Like most other Bettas, MG is playful but shy and doesn’t do very well around fin nippers (you wouldn’t if everyone around you was trying to bite your beautiful fins). However, they are active swimmers and active feeders. And that’s why it’s pretty easy to spot if your MG is stressed or sick. They will stray from your routine behavior.

As a centerpiece fish, they might be comfortable with any tank mates that stay out of their way. However, since it will predominantly occupy front and center, the rest of the “cast” can be bottom dwellers.


MG Bettas are carnivores. They would enjoy munching on appropriate palettes and flakes, but if you want to feed them something more than the standard “ration,” go with frozen or live food. A good mix would be better, with flakes and palettes as the main diet and live or frozen food on a weekly and bi-weekly basis. They may enjoy bloodworm, daphnia, and brine shrimp.

Further Reading: What do Betta Fish eat?

Size & Growth Rate

The MG Betta, at most, grows to 3 inches, but most fish you will find will have a size between 2-inch and 2.3-inch (6 cm). It’s important to understand that most Bettas we see in the aquarium business are bred for captivity. It has made them more aesthetically pleasing and allowed them to adapt to aquarium life. So the growth rate varies significantly among the Bettas (it depends upon their stock “lineage”).

Average Lifespan

Like most other Bettas, it’s expected to live around three to five years but can live longer in rare cases. How well you take care of your tank and how observant you are to your MG Betta’s health and behavioral changes can do a lot to ensure that your fish gets to live its whole life.

Further Reading: How long do Betta Fish live?


Sexing in MG Betta is relatively easy for full-grown members of the species; it’s pretty difficult to distinguish between the young ones.

The Male

The MG Betta, with its characteristically beautiful, long fins, is typically a male. This is because the color would also be more vivid in males with thinner and longer bodies. Some people even differentiate with the help of a mirror. However, when placed in the tank, a mirror will aggravate a make MG Betta, and it might try to attack its reflection (which it would take for a competitor in the tank). And though it’s difficult to spot in a shop, male Betta creates bubble nests when they are ready to mate.

The Female

Female MG Betta would usually be duller in color and have shorter fins (typically no longer than their heights). They are also thicker and broader, and if you look near the ventral fin, they will have a small white spot called the ovipositor tube. It’s the place where they lay their eggs.

How Rare Is A Mustard Gas Colored Betta?

Very. And that’s when we are talking about every mustard gas Betta out there. If we consider the pure stock the Jude Al bred, shared, or sold about twenty years ago (which had a very different appearance than what you might commonly find), that would be considered almost impossible to find. This is because so many people started breeding them from an MG male and another species female.

Nowadays, most of the MG Betta you’d see might not be MG (or bred from one) and simply another bi-colored Betta (different body and tail color) with tones and tail color very similar to the MG. It’s also often confused with Chocolate Betta, but they are not the same.

Mustard Gas Tail Types & Coloring Options

From an aesthetic point of view, it might be a blessing that so many people started out-crossing (or out-breeding) this beautiful rare species because now we get to see several different and beautiful varieties of this fish.


  • Blue: Blue was the primary body color for the first MG Bettas bred, which is still prevalent. It looks gorgeous, especially in contrast to the typical mustard-colored tail.
  • Green: The green sheen in the body is relatively rare, but it’s equally breathtaking. Some varieties have green veins stemming at the base of the caudal fin.
  • Blue & Orange: The blue and orange MG Betta usually doesn’t look like an MG. It has a relatively brighter blue body and a more vivid orange than the typical dull mustard color in the fins.
  • Black: Like blue, black was one of the original colors for MG Betta’s body, and its contrast is even better than blue. The black is typically a deep shade, and the outline of the caudal fin is also black.
  • Dragonscale: (Not from Skyrim) the Dragonscale is another rare mutation/gene which gives an MG Betta’s scale a metallic sheen. The most common Dragonscale color is still blue for the MG.

Tail Types

  • Halfmoon: Halfmoon is the most common Mustard Gas Betta tail type, carried on from the original species. The caudal fins of these MGs almost form a half-moon (or a half pizza, whichever you like to look at). The whole 180-degree “fanning” when the tail is fully stretched is why they are called Halfmoon in the first place.
  • Crowntail: Crowntail MG Bettas, with their sharp thorny tails, look badass. Unfortunately, their dorsal and anal fin are also the same prickly solid shape.
  • Delta: While swimming, a Delta MG’s tail is similar to a half moon’s, but if you see it fully stretched, it’s more triangular.
  • Rose-tail: Rose-tail is a remarkable variation of a half-moon, with several “folds” on the fin, which makes it look like a rose (with petals overlapping each other).
  • Veiltail: If you see an MG with a generous tail but swooping downwards instead of an equal portion of the bottom up and down, it’s probably a veil-tail. (though the veil is on the wrong end).
  • Fullmoon: The “moon” tail that crosses the 180-degree threshold is usually considered a full moon.

It’s important to understand that Mustard Gas Betta is so rare that there is no “standard” look anymore. Every breeder might have its particular strain and characteristic look. But almost all MG Bettas are exceptionally beautiful.

Pictures, Photos & Images Of Mustard Gas Betta Fish

Click here to see more Images Of The Mustard Gas Betta on our Pinterest Board.

What We Like About The Mustard Gas Betta Fish

There are several things to like about the Mustard Gas Betta.

  • It’s a unique beauty. Unlike Betta species that are very similar and get repetitive after a while, each MG Betta might be amazing.
  • Its rarity is another thing we love. But, of course, you can find a wide variety, and still, everyone might be “rare” in its way.
  • Centerpiece fish in any aquarium. The MG would brighten it with its beauty, whether it’s a community tank or a small, single-fish aquarium.
  • It’s perfect for small aquariums. However, a single MG can do the job if you don’t have a large tank and still want it to be eye-catching.
  • Easy to keep. Its rarity and uniqueness don’t come with a high maintenance cost and a list of demands. Instead, it’s like a beautiful pet unicorn of the Betta world, which requires the care level of a mule.
  • It has outer beauty, as well as inner beauty. Its charming personality and playfulness make it a very engaging pet to keep.

Where Can You Buy A Mustard Gas Betta?

That’s a bit tricky. On most of the typical fish websites, you would find the fish sold out half the time. And unless you want to go through the hassle of international shipping, specialty breeders and hobbyists are the best places to buy them. You may find their collections on their blogs or social media pages (mostly Pinterest) and can contact them.

In most stores, you will find fakes or MGs that are not even 1/8th of the species.


Q: How To Tell The Difference Between A Mustard Gas And Bumblebee Betta Fish?

Ans: Bumblebee Betta is a Petco label for bi-color Bettas that look much like MG Bettas. And since the original coloring doesn’t exist anymore, the difference is hard to tell. But a true MG Betta would have different shades/color bands in the tail that you can tell apart, but you can’t draw a line between two colors. The blending of different shades is “blurry.” Also, actual Mustard gas body coloration would have a visible blue, steely-blue, green, or steel hue. A Bumblebee’s tail would be more uniformly colored. Still, you may find an MG Betta being sold under the name of a Bumblebee Betta.

Q: How To Tell The Difference Between A Mustard Gas And Paradise Betta Fish?

Ans: There is no such thing as a Paradise Betta fish. It’s a made-up name, and most of the Paradise Betta are Mustard Gas Betta.

Unlock the Mystery: How Long Do Betta Fish Live? Dive into the fascinating world of betta fish lifespan. Learn the factors that influence their longevity and discover essential tips to maximize your betta’s lifespan. Ensure your beloved fish enjoys a long and vibrant life!

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