25 Vibrant Types of Rainbowfish to Brighten Your Aquarium

Boesemani Rainbowfish

One of the most recognized rainbowfish in the aquarium hobby, the Boesemani rainbowfish displays a two-toned color with a blue/purple head and an orange/red back end. These fish are easy to care for and are popular in tropical community aquariums due to their hardiness and their ability to be able to handle various water parameters. They thrive in groups, and males' colors become more vibrant during spawning.

Axelrod's Rainbowfish

(image from previous publication)

The Axelrod, or Axelrodi rainbowfish, named after tropical fish expert Herbert Axelrod, has a lighter body with a blue-tinged abdomen. It prefers slower moving water, similar to the gentle streams of its native Yungkiri Stream in Papua New Guinea.

Desert Rainbowfish

Desert rainbowfish, native to Australia, feature silvery-white females and white males with purple or green-tinged fins. Their limited range gives them specific water quality needs. With less bright coloration than many other rainbowfish species, they may blend more easily with lighter decor and stand out in darker environments.

Madagascan Rainbowfish

Fish keepers should note that the Madagascan rainbowfish prefers low pH water. Their native habitats feature extremely soft freshwater with low pH and tannin-stained water. These fish have a silver body with yellow fins, with males displaying more intense coloration than females. The Madagascan rainbowfish can coexist with South American cichlids like discus and angelfish due to similar water quality needs, and they enjoy strong currents.

Banded Rainbowfish

The banded rainbowfish is a popular species of rainbowfish, given their bright coloration and peaceful nature. Native to northern Australia freshwaters, males will have wider, more colorful bodies and a humped forehead. Both males and females have brightly-colored fins with a darker stripe along their midbody. This species prefers being in small groups in planted tanks. Like some other species, males will become aggressive during breeding.

Threadfin Rainbowfish

In addition to stark differences in their required pH and temperature, the threadfin rainbowfish has a very unique body and fin shapes. They prefer water that is soft to moderately hard, slightly acidic (pH 6.0 to 7.0), and with a temperature of 73 to 84 F (23 to 29 C). They are significantly smaller than other species of rainbowfish, with thin bodies and long extensions on the dorsal and anal fins on males. In addition to their elongated fins, males have faint vertical stripes with red/orange caudal fins. 

Celebes Rainbowfish

The Celebes rainbowfish is a smaller, more slender species of rainbowfish. This species likes to be kept in large schools of eight to 10 fish, so be sure to plan your aquarium accordingly so that you have enough room for everyone. Celebes rainbowfish have a unique fin shape with two dorsal fins colored yellow/golden and black, and a translucent body.

Neon Rainbowfish

The neon rainbowfish is one of the smallest rainbowfish species in the commercial market. Given their smaller size, they like to be in larger groups of 10 or more individuals. They are very picky about their water quality parameters, so be sure to pay special attention to your water tests if you are adding a bunch of fish at once. They are named for their neon blue and green coloration, which can present as a brilliant flash in your aquarium as they all school together.

Lake Kutubu Rainbowfish

The Lake Kutubu rainbowfish is named for their origin at Lake Kutubu in Papua New Guinea. This species of rainbowfish is known for their jewel-tone blue, yellow and/or turquoise appearance. Like most rainbowfish species, the males tend to be more vibrantly colored than females.

Red Irian Rainbowfish

The red rainbowfish, or red Irian rainbowfish, originates from New Guinea’s Tami River and Lake Sentani. Males can be differentiated from females by their bright red coloration with high rounded back. In contrast, females have silver bodies with tints of yellow and green.

Lake Wanam Rainbowfish

Although the Lake Wanam rainbowfish is named for their origins in Lake Wanam in Papau New Guinea, you are very unlikely to find any remaining in their home waters. The Lake Wanam rainbowfish is listed as critically endangered and not common in the hobby, and only sold through specialized breeders. As with any fish species you are looking to purchase, always consider if your fish is coming from a breeder or collected from wild stock.

Forktail Rainbowfish

The forktail rainbowfish is a small, slender species of rainbowfish with blue eyes and namesake forked tail. Their colors brighten during breeding season, with the males becoming brilliantly yellow. Given their small size, this species really likes being in large groups with lots of plants to hide in.

Crimson-Spotted Rainbowfish

Also known as Duboulay's rainbowfish, the crimson-spotted rainbowfish is so named for the characteristic red spot on both sides of their head. Their red coloration continues as red/orange speckles, which may conjoin to form lines, along their body sides. They are native to Australia and have been released into swamps and rivers to help combat mosquitos by eating the aquatic mosquito larvae.

Murray Rainbowfish

The Murray River rainbowfish, also known as Murray rainbowfish or Australian rainbowfish, has more subtle colors, often being a soft rainbow of blue, green, yellow or silver. Male Murray River rainbowfish will have a bright orange stripe on their back end when they are getting ready to spawn.

Redfin Dwarf Rainbowfish

The redfin dwarf rainbowfish has a unique appearance with black stripes and vibrant red/orange tinged fins. Native to Australia, this rainbowfish can tolerate a wide range of water quality parameters, and they breed readily in captivity.

Parkinsoni Rainbowfish

The Parkinsoni rainbowfish is a mix of silver and vivid yellow colors. Depending on the individual, they may have a lot of yellow pigmentation on their sides or only in their fins.

Spotted Blue-Eyed Rainbowfish

The spotted blue-eyed rainbowfish, also know as Gertrude's spotted rainbowfish, is a small species of rainbowfish that has a unique fin appearance with black spots and vivid yellow tint. As the name implies, their eyes are ringed with blue, giving them a very vibrant appearance. This species of rainbowfish is very small, so they do best in schooling groups of six or more fish.

Lake Tebera Rainbowfish

The Lake Tebera rainbowfish originates from Papau New Guinea near Lake Tebera. Like Axelrod's rainbowfish, this fish takes their scientific name from aquarist, Herbert Axelrod. They can have a vibrant yellow body with a black stripe along the middle of their sides. Their fins may be tinted red or yellow.

Sentani Rainbowfish

Although they may not be considered very "colorful" compared to other rainbowfish, the orange/tan coloration of the Sentani rainbowfish is a bright contrast against the greens of a planted aquarium. Their fins have a mix of blue/green/red pigments that catch the light as they dart around their tank. This is a critically endangered species, so be wary of where you purchase this species and ensure they are captive-bred individuals. The Sentani rainbowfish shares habitat with the red rainbowfish and is commonly mistaken for Chilatherina fasciata.

Eastern Rainbowfish

A close relation to the desert rainbowfish, the Eastern rainbowfish has a more orange and gray coloration with iridescent scales. They are best visualized in brightly lit aquariums with lots of plants. This is a larger rainbowfish, but still does best in a small group.

Ajamaru Lakes Rainbowfish

The Ajamaru Lakes rainbowfish, or Ajamaru rainbowfish, is from the Ajamaru Lakes in West Papua, Indonesia. Like other rainbowfish, they like being in shoals and in well-planted tanks. These are bi-colored fish, featuring shades of blue and yellow on the body. Also, this species is another that is critically endangered, so care needs to be taken to ensure you purchase these fish from reputable breeders.

Aru Rainbowfish

Also known as the painted rainbowfish, the Aru rainbowfish is truly stunning, especially when seen swimming through a planted tank. These fish like to live in aquariums that have rocks and driftwood they can swim around, too. Males feature a blue-gray color with a red spot on the face.

Barred Rainbowfish

Barred rainbowfish are from New Guinea. They prefer a pH that is 7.1 to 8.1, and water temperatures that are anywhere from 82 to 90 F (28 to 32 C). This species also boasts various body colors, with males being more deeply colored than females. And when males are spawning, the top of their head will be bronze.

Black Banded Rainbowfish

As the name implies, the black banded rainbowfish has a long black stripe that runs along the middle of the body from the head to the tail. And, like other rainbowfish species, this one is iridescent, so they look brilliant when swimming throughout your aquarium. To mimic their natural habitat, add plants to your tank along with a substrate of fine gravel.

Bonti Rainbowfish

Bonti rainbowfish are brightly colored and slender, with big eyes. These schooling fish also have beautiful, delicate fins (including two dorsal fins), so they shouldn’t be kept with other fish that might nip at them. They can showcase a variety of hues on their light-colored body and can have yellowish fins that stand out.