Betta Fish Colors & Patterns: An Illustrated Identification Guide

A betta’s color is a painting done in layers. Underneath is a base of pigment: black, red, yellow. On top sits a layer of reflective cells that turns parts of the fish into blue, green, steel or copper, depending on how the light hits them. Then come patterns that decide where each layer shows. Once you see the fish that way, even the strangest store label starts to make sense.

Color, Pattern and Fin Form Are Three Different Things

Color is the hue: red, royal blue, yellow. Pattern is how the colors are arranged: solid, bicolor, butterfly, marble. Fin form is the shape: halfmoon, plakat, crowntail. Each of the three is inherited separately, so a red butterfly can be a halfmoon or a plakat. “Plakat” is a fin form, not a color. For tail shapes, see our illustrated guide to betta tail types.

Where Betta Colors Come From

Betta skin contains several kinds of pigment cells. Melanophores make black and dark brown. Erythrophores make red and orange. Xanthophores make yellow. Iridophores work differently: they contain no colored pigment, only reflective crystals made from purines (mainly guanine). They act like tiny mirrors, and the blues, greens and metallic shades you see are light reflected off those crystals.

Bettas make their own melanin, but the red and orange carotenoids come from food. A 2022 genome study (Kwon et al.) found more beta-carotene and echinenone in the skin of red bettas than in blue ones. That’s the real basis for “color-enhancing” foods: they supply raw material, they don’t change the genes.

The same study answers a question breeders have asked for decades: why is a perfect red betta with no blue sheen so hard to produce? The gene most strongly associated with blue iridescence (alkal2l, probably the “spread iridocyte” gene breeders talk about) sits only about 50,000 base pairs from a gene involved in red carotenoid metabolism (bco1l). Genes that close together tend to be inherited as a pair. Selecting against one keeps dragging the other along.

Betta Colors

Red is the most common color in the trade, ranging from cherry to deep crimson. A good red has no blue or steel sheen on the body, and that’s rarer than it sounds for the genetic reasons above. Red fades quickly when a fish is stressed or poorly fed, so a dull red is often the first sign that something is off.

Blue isn’t a pigment. It’s structural color from iridophores, which is why it shifts as the fish turns. The IBC recognizes three iridescent blues. Royal blue is deep and saturated. Steel blue is grayish and cool. Turquoise leans toward green.

Green exists, but a “true green” (the IBC has a separate subtype for it) is rare. Most fish sold as green are turquoise that look green under certain lighting.

Yellow bettas (sometimes called “non-red”) range from pale lemon to deep butter. A common flaw is red bleeding into the fins. Orange sits between red and yellow and is genuinely harder to find. Breeders find it difficult to keep consistent across generations.

Black comes in several forms. Melano is the deepest, flattest black, but breeders consistently report that melano females are effectively infertile, so the line is carried through black males or carrier females. Black lace is a fertile black with lighter, translucent fin edges. Black copper is black with a metallic copper sheen. The black orchid is a black fish with bright accent color between the fin rays, like light breaking through.

White needs a closer look. An opaque white is solid, chalky white with no visible flesh underneath. Pastel is a pale iridescent wash over a light body. A cellophane fish is translucent: you can see pinkish flesh, but the eyes are black. A true albino has pink or red eyes, is rare, and usually has poor eyesight. The rule: if the eyes are black, it isn’t an albino.

A solid, even purple is one of the hardest colors to find. Most “purple” fish are a blue or metallic layer over a red base, and their color shifts with the light.

Betta Patterns

The IBC sorts colors into three groups: single color, bicolor and patterned. That’s the framework we use here.

Solid (single color): the same color over the head, body and fins. Small faults are common, such as a few stray red rays on a blue fish.

Bicolor: the body is one color and the fins are another. The classic Cambodian has a pale, flesh-colored body with red fins. Genome work links the intense fin color to a gene that controls red saturation in the fins but not the body. The mustard gas has a dark blue, green or steel body with yellow or orange fins. The chocolate (in IBC terms, black/yellow) has a dark brown body and yellow fins.

Butterfly: the fins carry clear bands of color, usually a solid inner band and a pale or white outer band. The key quality is a crisp line between the bands. Unlike what some guides claim, the IBC judges butterfly bettas as their own subgroup.

Marble: irregular, high-contrast patches that can rearrange themselves throughout the fish’s life. A white fish can grow black patches, lose them, and then turn blue. Many keepers attribute this to a “jumping gene” (a transposon). The explanation is widely repeated but, as far as we could find, not yet confirmed in published betta genome studies.

Koi: marble-type patches of red, black and white (sometimes yellow, orange or blue) on a pale or cellophane base, like a miniature koi carp. Because koi usually carry marbling, the pattern you buy is rarely the pattern you’ll have a year later.

Dalmatian: a light body with small, evenly spaced spots, usually on the fins. Sources disagree here: the IBC places it in the marble subgroup, while Aquarium Co-Op describes it as non-marble. In practice, watch your fish. If the spots move around over the months, there’s marbling in the mix.

You’ll also come across multicolor (three or more colors in no set arrangement), grizzled (fine flecks, as if painted with a dry brush), and piebald (a white or flesh-colored face on a darker body).

Metallic Sheen and Scale Types

Metallic: an extra reflective layer on top of the base color, giving it a polished-metal look. Breeders treat it as an inherited “metallic gene” that stacks on other colors.

Copper: despite its warm tone, a copper betta is built on a steel blue base with a strong metallic layer on top. The IBC literally lists it as “Metallic Copper (Steel Blue).” Under weak light, a copper can look plain tan or brown, so judge it under bright light.

Mask: a normal betta has a dark face. On a “masked” fish, the iridescent body color extends over the head too.

Dragon scale: a thick, opaque metallic layer covers each scale, giving an armor-plated look over a base color, often red or black. Despite how it looks, it isn’t thicker scales but a dense layer of reflective cells. The real risk is diamond eye: the layer can keep growing over one or both eyes and cause partial or total blindness. On a juvenile, check whether the metallic layer already reaches the pupil. If it does, the risk is high. A fish with diamond eye can still live normally, but it will need food dropped right in front of it.

Pineapple: a yellow or orange body with each scale outlined in a dark edge, like the crisscross on a pineapple.

Trade Names: Galaxy, Samurai, Nebula, Nemo and Candy

These names are marketing, not official standards. They come from Thai and Indonesian breeders and online sellers, and they vary from one seller to the next. Here’s what each one usually means:

• Galaxy: a dark or koi-type base with scattered iridescent blue or white flecks, like stars.
• Nebula: similar to galaxy, with softer, more cloudy color transitions.
• Samurai: a dark base (often black) heavily covered in dragon-type metallic scaling, with the dark scale edges showing through like armor plates.
• Nemo: a koi-type fish dominated by orange, often with red, black and white.
• Candy: a koi-type fish with many colors, often including pink or blue on a pale base.

The IBC has started testing a classification for these fish: an optional trial grouping for Area 6 in its 2025-2026 standards, with categories like “koi base fancy” and “sparkling iridescent fancy.” Until that becomes standard, buy the fish you actually see, not the label.

Before You Buy: Don’t Trust the Photo

Here’s the trap few guides mention. Blue, green, copper and metallic colors are reflected light, so they change completely with the lighting. Seller photos are often taken under strong blue LEDs, sometimes with the saturation boosted. The same fish under your warm living room light can look a whole shade duller. Ask the seller for a short video in neutral or natural light. Expect iridescent colors to look less vivid at home, while pigment colors like red, yellow and black usually look about the same.

Color Changes: What’s Normal and What Isn’t

Nothing sends a new owner to a forum faster than a betta that changes color overnight. Most of the time it’s genetics. Sometimes it isn’t. And from the front of the tank, the two can look the same.

A friend of Nicolas, our editor, found this out with a fish called Pearl. He’d bought him as a solid opaque white “platinum” betta, a small ghostly pearl of a fish. Three weeks into life in a heated, planted tank, Pearl had a dark smudge across his face and blue and red specks spreading over his fins. His owner assumed the worst, ammonia burn or fungus, and posted photos on a betta forum asking whether his fish was dying. Nobody told him to buy medicine. The verdict: a marble sold as a platinum, and nothing wrong with him except a marble gene doing its job. Months later there isn’t a trace of white left. Pearl is deep royal blue with red patches on his tail, perfectly healthy, and a completely different fish from the one in the store. He got a new name to match: Picasso. As Nicolas’ friend puts it, buying a marble isn’t buying a pet, it’s subscribing to a monthly color mystery box.

⚠️ Watch out: don’t assume every color change is marbling. Work through the lists below first.

Normal:

• Coloring up after purchase. Many store bettas are pale from stress and from living in a cup. Give them two to four weeks in a heated, filtered tank.
• Marble and koi shifts. New patches, lost patches, color changes, sometimes for years. Casper went from white to royal blue.
• Marble and koi shifts. New patches, lost patches, color changes, sometimes for years.
• Vertical bars on females. This usually means she’s ready to breed.
• Slow fading in old age.

Worth checking:

• Horizontal stripes along the body. These are stress stripes. Test the water and look for the cause, such as a temperature drop, a new tankmate or strong flow.
• Sudden overall paleness with clamped fins. Test for ammonia and nitrite first. Ammonia should be zero; even a small reading calls for a water change the same day.
• A fine gold or rust-colored dust. Shine a flashlight at an angle across his body. This dust is the classic sign of velvet, a parasite, and it needs treatment.
• White, cottony patches. These suggest a fungal or bacterial infection, not a color change.
• Fin edges turning dark and melting. This is fin rot. Thin, clear new growth at the fin edges, on the other hand, is a sign of healing.

For more on fading, see our guides on betta fish losing color and stressed bettas.

Keeping Colors Strong

Good genes set the ceiling, and care decides how close your fish gets to it. Keep the water stable at 76-82°F (we aim for around 78-80°F) and do weekly 25-30% water changes. Feed a quality betta pellet with krill, shrimp or astaxanthin high on the ingredient list, and add frozen treats like brine shrimp or daphnia. Skip the spinach and vegetable wafers sometimes recommended: bettas are carnivores. Floating plants and a darker background reduce stress, and a calm betta shows his best colors. Indian almond leaves tint the water, which can make reds look deeper. That’s partly an optical effect, not a change in the fish.

Quick Identification Table

What you see	Likely name	Quick check
Pale flesh body, red fins	Cambodian	Body color is light, not white
Dark blue/green body, yellow-orange fins	Mustard gas	Dark body is iridescent
Clear bands at the fin edges	Butterfly	Sharp line between bands
Random patches that shift over time	Marble	Compare photos month to month
Red/black/white patches, pale base	Koi	Usually marbled, so it may change
Thick metallic plates on scales	Dragon scale	Check whether the layer reaches the eyes
Dark scale edges on yellow/orange	Pineapple	Edge pattern covers the body
Brown-looking fish that gleams in light	Copper	Look under bright light
Black with color between the fin rays	Black orchid	Accent color sits between the rays
Translucent, black eyes	Cellophane	Red/pink eyes = albino
Dark base with star-like flecks	Galaxy (trade name)	No official standard

What Other Betta Keepers Ask Most

The most frequent panic on r/bettafish: “My betta is changing color, is he sick?” In most threads, the fish turns out to be a marble or koi doing what marbles do. One keeper described a fish bought as black, white and light blue that turned almost entirely blue within two months, Pearl’s story on fast-forward. The community’s usual answer: if he’s eating, swimming normally and your water parameters are clean, it’s genetics. Dark spots that appear together with odd behavior or a recent ammonia spike deserve a closer look.

The second most common question: “What’s the difference between koi, nemo, galaxy and candy?” A breeder in one thread gave detailed definitions. Another reply put it more simply: these are terms thrown around by sellers, with no official standard. Both are true, which is exactly why we listed the common meanings above while flagging them as marketing names.

Dragon scale owners regularly ask about scales growing over the eyes. Forum regulars agree that it depends on the fish’s genetics, and that a juvenile whose metallic layer already approaches the pupil will most likely lose some sight.