Category: The AquariumStoreDepot.com blog

Table of Contents

• What Care Guides Get Wrong
• Key Takeaways
• Species Overview
• Classification
• Origin & Natural Habitat
• Appearance & Identification
• Average Size & Lifespan
• Care Guide
• Is It Right for You?
• Tank Mates
• Food & Diet
• Breeding & Reproduction
• Common Health Issues
• Common Mistakes to Avoid
• Where to Buy
• Frequently Asked Questions
• Species Comparison
• Closing Thoughts
• Recommended Video
• References

The neon green rasbora has an iridescent green-gold stripe that glows under the right lighting conditions. Under the wrong lighting, it looks like a plain, pale micro fish. The difference is entirely about setup: subdued or angled lighting, dark substrate, and a planted background that lets the iridescence catch. This is a fish that looks like two completely different species depending on your tank.

In a properly lit nano tank with a large group, neon green rasboras create a shimmering effect that is hard to match with any other nano species. This guide covers how to set up for the glow, because the neon green rasbora looks electric under the right light and invisible under the wrong one.

Your lighting setup will make or break this fish. Get it right and the green is electric. Get it wrong and you paid for nothing.

Key Takeaways

• Not actually a rasbora, despite the common name, this species belongs to the family Danionidae and the genus Microdevario, making it a danio relative
• One of the few truly green freshwater fish, the vivid neon green/chartreuse coloration is rare in the hobby and makes this species a standout in planted tanks
• Very small, maxes out at just 0.8 inches (2 cm), making it one of the tiniest fish commonly available
• Needs a proper school, keep at least 8-10 to see natural shoaling behavior and the best coloring
• Great nano tank candidate, a 10-gallon is sufficient for a school, and they’re peaceful enough for community setups with similarly sized fish
• Named after Katsuma Kubota, a Japanese ichthyologist who contributed to the study of Southeast Asian freshwater fish

Species Overview

Classification

The common name “neon green rasbora” is misleading from a taxonomic standpoint. True rasboras belong to the family Cyprinidae and genera like Rasbora and Trigonostigma. Microdevario kubotai, on the other hand, sits in the family Danionidae, the same family as zebra danios and Celestial Pearl Danios. The genus Microdevario is small, containing just a handful of species, all of which are tiny cyprinids from Southeast Asia.

The species was formally described in 1999 by Maurice Kottelat and Karl-Heinz Witte. The species name kubotai honors Katsuma Kubota, a Japanese ichthyologist who made significant contributions to the study of freshwater fishes in the region. Some older references may list this fish under Boraras or Microrasbora, but Microdevario is the currently accepted genus. For hobbyists, the practical takeaway is the same as with many small Southeast Asian “rasboras”, the common name doesn’t match the actual taxonomy, and you should look at care requirements for the specific species rather than relying on what other “rasboras” need.

Origin & Natural Habitat

The neon green rasbora comes from the Ataran River basin in southeastern Myanmar, near the border with Thailand. The Ataran River (also known as the Kasat River) is a tributary of the Salween River system, flowing through the hilly terrain of Mon State and Kayin State. This is a region of dense tropical and subtropical forest, with clear, moderately flowing streams feeding into larger river channels.

In the wild, Microdevario kubotai is found in small streams and tributaries rather than the main river channel. These are typically shallow, clear-water habitats with moderate flow, substrates of gravel and sand, and varying amounts of submerged vegetation and leaf litter along the margins. The water in these streams is soft and slightly acidic to neutral, influenced by the surrounding forest canopy and the geology of the watershed.

The fish occupy the upper and middle portions of the water column, shoaling in loose groups among submerged plants and overhanging vegetation. The forest canopy provides dappled shade, which is worth keeping in mind when you set up a tank for these fish, they’re not a species that evolved under blazing sunlight over open water. They’re stream fish accustomed to filtered light and moderate flow.

While not currently assessed as endangered by the IUCN, the neon green rasbora’s habitat faces pressure from deforestation, agricultural development, and mining activity in the border region between Myanmar and Thailand. Most specimens available in the hobby are wild-caught, though some captive-bred stock is beginning to appear from commercial breeders in Southeast Asia.

Appearance & Identification

This is a fish that earns its name. The neon green rasbora has a slender, elongated body that displays a vivid neon green to chartreuse coloration across the flanks and back. The intensity of the green can shift between a more yellowish-green and a cooler blue-green depending on the lighting, the fish’s mood, and its diet. Under good LED lighting in a planted tank, the effect is genuinely striking, these fish seem to glow.

The body is somewhat translucent, particularly along the belly, which allows you to see hints of the internal structures. A faint darker lateral line may be visible along the midline. The fins are mostly clear to slightly yellowish, and the overall impression is of a sleek, streamlined little fish that’s all about that green glow. There aren’t bold stripes, spots, or markings to speak of, the color itself is the main event.

What makes this fish genuinely special in the hobby is the rarity of true green coloration among freshwater species. Plenty of fish are marketed as “green” but actually lean more toward olive, teal, or blue-green. Microdevario kubotai is one of the few species that delivers an authentic, vivid green that’s immediately recognizable in a tank. A school of 10 or more in a well-planted aquarium creates a visual effect that’s hard to achieve with any other species.

Male vs. Female

Sexing neon green rasboras is tricky with young fish, but becomes more straightforward as they mature. Males are typically slimmer and may display slightly more intense coloration, particularly when competing for female attention or establishing minor hierarchies within the group. Their bodies remain lean and torpedo-shaped.

Females are noticeably rounder and fuller-bodied than males, especially when carrying eggs. A gravid female will have a clearly distended belly that’s visible from above. The color on females is slightly less vivid than the brightest males, but the difference is subtle and can be hard to spot unless you’re comparing fish side by side. In a shoal, the plumper individuals are almost always female.

Average Size & Lifespan

The neon green rasbora is a genuinely tiny fish. Adults max out at about 0.8 inches (2 cm), making it one of the smallest species regularly available in the freshwater hobby. Most individuals in aquarium conditions will hover right around that 0.8-inch mark once fully grown. These are not fish you buy expecting much size, you buy them for the color and the schooling behavior.

In terms of lifespan, well-cared-for neon green rasboras can live 3 to 5 years. That’s a solid stretch for a micro fish, and it’s achievable if you maintain stable water quality, feed a varied diet, and keep them in a proper group. Fish that are chronically stressed by poor conditions, insufficient numbers, or aggressive tank mates will have shortened lifespans, as is the case with most nano species.

Care Guide

Tank Size

A 10-gallon (38-liter) tank is the minimum for a school of neon green rasboras. While these are tiny fish, they need to be kept in groups of at least 8-10, and the tank needs enough room for planting and some open swimming space. A 10-gallon long with a good layout gives you the footprint to create a nice planted setup with room for the school to move around.

If you’re planning a nano community with other small species, step up to a 15 or 20-gallon. The extra volume gives you more flexibility with stocking and helps maintain more stable water parameters, which is always a plus with small fish. A 20-gallon long is particularly good for nano communities because of the extra swimming length.

Water Parameters

Neon green rasboras come from soft, slightly acidic to neutral streams, and they do best when you match those conditions in the aquarium.

The temperature range is fairly forgiving compared to some nano species. They’ll tolerate the mid to high 70s just fine, but you don’t need to push the heater up to 80°F. A comfortable room temperature setup in the low to mid 70s is a sweet spot where you’ll see active behavior and good coloring.

Water softness is the more important factor. These fish come from soft-water streams, and hard, alkaline tap water (above 10 dGH or pH above 7.5) will dull their coloring and cause long-term stress. If your tap water is naturally soft and slightly acidic, you’re in great shape for this species right out of the faucet. If you have harder water, consider using a mix of RO water to bring the hardness down, or set up with active substrate and driftwood that will naturally soften things.

Filtration & Water Flow

A gentle to moderate flow works best. In the wild, neon green rasboras inhabit streams with some current, so they’re not a completely still-water species. That said, they’re tiny fish that can be pushed around by strong filtration output. A sponge filter is the ideal choice for a dedicated nano setup, it provides biological filtration without creating excessive current, and the sponge surface grows biofilm that these micropredators will pick at between feedings.

If you’re using a hang-on-back or canister filter, diffuse the output with a spray bar or baffle to prevent strong directional flow. You want enough circulation to keep the water oxygenated and evenly heated, but not so much that the fish are fighting a current all day. Watch how they’re swimming, if they’re constantly bracing against the flow rather than moving freely, the current is too strong.

Lighting

Moderate lighting brings out the best in neon green rasboras. You want enough light to support healthy plant growth and make those green bodies pop, but not so much that the tank feels overexposed. These fish come from shaded forest streams, and they’ll show their most confident behavior and richest coloring under softer lighting conditions.

A planted tank LED on a timer (8-10 hours per day) is perfect. Adding some floating plants like red root floaters, salvinia, or water lettuce will help create pockets of shade and dappled light, which mimics their natural environment. Under this kind of lighting, the green coloration really seems to glow. Under harsh overhead light with no cover, the fish will look washed out and spend more time hiding.

Plants & Decorations

Planting is important for neon green rasboras. A bare tank with no cover will produce stressed, pale fish. You don’t necessarily need the extreme density required by some ultra-shy nano species, but at least 40-50% plant coverage gives them the security they need to behave naturally and show off their color.

Good plant choices include java moss, java fern, Cryptocoryne species, Rotala, Hygrophila, and stem plants that create vertical structure in the mid and background. Floating plants are especially valuable for providing overhead shade. Driftwood works well in the setup too, it releases tannins that gently lower pH and soften the water, which is exactly what these fish prefer.

Leave some open areas in the front or center of the tank for the school to swim through. The contrast between planted sections and open swimming lanes lets you watch the group move as a unit, which is one of the real pleasures of keeping a species like this.

Substrate

A fine gravel or sand substrate works well. If you’re growing rooted plants (and you should be), a nutrient-rich planted tank substrate or an inert sand with root tabs is a good approach. Active substrates like aquasoils that buffer toward slightly acidic pH are actually a benefit for this species, since they prefer soft, slightly acidic conditions.

A dark substrate will make the green coloration pop more dramatically than a light-colored bottom. Dark sand or dark aquasoil creates a nice visual contrast and encourages the fish to display deeper color. Light substrates aren’t harmful, but aesthetically, you get more visual impact with a darker base.

Is the Neon Green Rasbora Right for You?

Before you buy, run through this honest checklist. The Neon Green Rasbora is a great fish for the right keeper, but it is not for everyone.

• You have a well-established nano tank (10+ gallons) with stable parameters
• You enjoy subtle iridescent coloring that changes with the light
• You can keep a group of 10+ for proper schooling
• Your tank has a dark substrate and moderate lighting
• You keep soft to moderately hard water with neutral to slightly acidic pH
• You want a species that rewards patient observation rather than demanding immediate attention

Tank Mates

The neon green rasbora’s small size and peaceful temperament make tank mate selection straightforward, just keep everything small and calm. Any fish big enough to eat a 0.8-inch fish will likely try, and anything aggressive or highly active will stress them out and push them into hiding.

Best Tank Mates

• Celestial Pearl Danios, Similar size, similar temperament, and the gold/red tones contrast beautifully with the neon green
• Chili Rasboras (Boraras brigittae), Another tiny, peaceful nano species that shares soft water preferences
• Ember Tetras, Small enough to be safe, peaceful, and the warm orange complements the green nicely
• Pygmy Corydoras (C. Pygmaeus), Gentle bottom-dwellers that stay small and won’t compete for space in the water column
• Dwarf Corydoras (C. Habrosus), Same benefits as pygmy corys, slightly different behavior pattern
• Otocinclus catfish, Peaceful algae grazers that completely ignore other fish
• Cherry shrimp and amano shrimp, Safe companions that add cleanup and visual interest
• Nerite snails, Excellent algae control with zero aggression risk
• Other Microdevario species, If you can find them, other species in the genus are natural companions

Tank Mates to Avoid

• Bettas, Too territorial for a tiny fish like this, and the enclosed space of a nano tank makes aggression worse
• Barbs (tiger, cherry, etc.), Too boisterous, nippy, and competitive at feeding time
• Guppies and mollies, Prefer harder, more alkaline water and are active enough to stress out neon green rasboras
• Dwarf cichlids (rams, apistos), Too large and territorial, especially during breeding
• Any fish over 2 inches, At 0.8 inches, neon green rasboras are snack-sized for most community fish. Keep tank mates small
• Aggressive or fast-swimming species, Anything that dominates feeding time or claims territory will push these tiny fish into permanent hiding

Food & Diet

Neon green rasboras are micropredators with very small mouths. In the wild, they feed on tiny invertebrates, insect larvae, zooplankton, and biofilm. In the aquarium, you need to match the food size to the fish, standard-sized flakes and pellets are too large for them to eat comfortably.

Here’s what works well:

• Crushed high-quality flakes or micro pellets, These are more readily accepted than with some other micropredators, but crush them fine enough for tiny mouths
• Baby brine shrimp (BBS), The perfect size and a strong feeding trigger for just about any nano fish
• Frozen cyclops, Widely available and an excellent staple frozen food for micro fish
• Daphnia (small), Moina or young daphnia are great for variety and nutrition
• Micro worms and vinegar eels, Easy to culture at home and perfect for supplemental feeding
• Frozen baby brine shrimp, A convenient frozen alternative when live cultures aren’t available
• Grindal worms, Small enough for adults and easy to culture

Feed small amounts twice a day rather than one large feeding. These fish have tiny stomachs and do much better with frequent, small meals. A mix of high-quality crushed dry food supplemented with live or frozen foods several times a week will keep them healthy and colorful. The live and frozen foods, in particular, will intensify the green coloration. If you notice the color looking dull, improving the diet is often the first thing to try.

In a community tank, watch carefully to make sure the neon greens are actually getting food. They’re not aggressive feeders, and faster or larger tank mates can easily outcompete them at mealtimes. Target feeding with a pipette or turkey baster directly into the school can help.

Breeding & Reproduction

Breeding neon green rasboras in captivity is possible but not particularly easy. They’re egg scatterers that show no parental care, and the fry are extremely small at hatching. Successful breeding requires dedicated setup and a commitment to culturing tiny foods for the fry.

Breeding Difficulty

Moderate to difficult. Getting conditioned adults to scatter eggs isn’t the hardest part, raising the microscopic fry is where most hobbyists struggle. You’ll need infusoria or similar first foods ready to go before the eggs even hatch.

Spawning Tank Setup

Set up a small 5 to 10-gallon breeding tank with plenty of fine-leaved plants or spawning mops. Java moss is ideal because eggs settle into the moss structure where they’re somewhat protected from being eaten by the adults. A mesh or marble substrate layer is another option to keep eggs out of reach. Lighting should be dim and the tank well-covered to reduce stress.

Use a gentle air-driven sponge filter. Anything stronger risks sucking in eggs or the tiny fry once they hatch. Keep the water shallow, 6 to 8 inches of depth is sufficient and makes it easier for the fish to find each other and for you to manage the fry later.

Water Conditions for Breeding

Soft, slightly acidic water seems to produce the best spawning results. Aim for a temperature of 75-77°F (24-25°C), pH around 6.5, and GH of 2-4 dGH. These conditions are slightly warmer and softer than the middle of their general care range, which can help trigger spawning behavior. A small water change with slightly cooler water will act as a spawning trigger, mimicking the effect of a rain event.

Conditioning & Spawning

Condition a group of adults with generous portions of live baby brine shrimp, daphnia, and other small live foods for 1-2 weeks before introducing them to the breeding setup. Well-fed females will become noticeably rounder as they fill with eggs. A ratio of roughly 2 males per female gives the best chances of successful fertilization.

Spawning usually occurs in the early morning hours. Males will display and chase gravid females through the plants, and the pair scatters small adhesive eggs among the fine-leaved vegetation. Clutches are typically small, perhaps a dozen or so eggs per spawning event, but spawning may occur over consecutive days if conditions remain favorable. The adults show no parental interest and will eat the eggs if they can find them, so remove the adults after spawning activity stops.

Egg & Fry Care

Eggs are tiny, clear, and adhesive. They typically hatch in 24 to 48 hours depending on temperature. The newly hatched fry are almost invisible to the naked eye and will absorb their yolk sacs over the first day or two before becoming free-swimming.

This is the make-or-break stage. The fry are too small for baby brine shrimp initially. Start them on infusoria, paramecium, or a high-quality commercial liquid fry food. Green water (a tank with a controlled algae bloom) can also support infusoria populations that provide continuous grazing for the fry. After about 7-10 days, the fry should be large enough to start taking newly hatched brine shrimp, which will accelerate growth.

Keep the water pristine with small, frequent water changes (10% every other day) matched to the breeding tank parameters. Growth is slow, and it can take 2-3 months before the fry start showing the characteristic green coloration and begin to resemble miniature adults.

Common Health Issues

Ich (White Spot Disease)

Like most freshwater fish, neon green rasboras are susceptible to ich, especially after the stress of shipping or introduction to a new tank. The telltale white spots are easy to identify. When treating, use a half-dose medication appropriate for small, sensitive fish. These are tiny animals with a high surface-area-to-body-mass ratio, so full-dose treatments will be too much. Raising the temperature to 82-84°F (28-29°C) alongside the medication can speed up the parasite’s life cycle and make treatment more effective.

Bacterial Infections

Poor water quality is the primary driver of bacterial infections in nano fish. Fin rot, cloudy eyes, or red streaking on the body are common signs. These fish are sensitive to ammonia spikes and elevated nitrates, and in a small tank, water quality can deteriorate quickly if maintenance is skipped. Prevention through regular water changes and good filtration is far more effective than treatment. If infections occur, a broad-spectrum antibacterial medication at a reduced dose is the standard approach.

Internal Parasites

Since many neon green rasboras in the hobby are wild-caught, internal parasites are a real possibility. Signs include wasting (losing weight despite eating), white stringy feces, lethargy, and a sunken belly. Quarantining new fish for 2-4 weeks before adding them to your display tank gives you time to spot these issues. If parasites are suspected, medicated food containing praziquantel or metronidazole is the go-to treatment.

Stress-Related Color Loss

The most common “health” problem with neon green rasboras is really a husbandry problem: dull, washed-out color. This is almost always caused by stress from hard water, insufficient cover, a group that’s too small, aggressive tank mates, poor diet, or some combination of those factors. The fix isn’t medication, it’s fixing the environment. Once conditions improve, the vibrant green usually returns within a week or two.

Common Mistakes to Avoid

• Keeping too few. A pair or a group of 3-4 will be stressed, pale, and constantly hiding. These are shoaling fish that need the security of numbers. Start with at least 8-10 for the best behavior and coloring.
• Wrong water hardness. Neon green rasboras are soft-water fish. If your tap water is very hard (above 10-12 dGH), you’ll struggle to get good coloring and long-term health from this species. Test your water before buying and consider blending with RO water if needed.
• Food too large. Standard-sized flakes and pellets are too big for a 0.8-inch fish. Crush dry foods to a fine powder or use micro-sized products designed for nano fish. Supplement with live and frozen foods that match their mouth size.
• Overpowered filtration. Strong current from oversized filters will exhaust these tiny fish. Use a sponge filter or baffle the output on powered filters. Watch the fish, if they’re struggling against the flow, it’s too strong.
• Skipping quarantine. Many neon green rasboras are wild-caught and can carry parasites or diseases that aren’t immediately visible. Quarantine new arrivals for 2-4 weeks in a separate tank before adding them to your display.
• Not enough plants. A bare or sparsely decorated tank will stress these fish. They need plant cover to feel secure and show their best color. Floating plants for overhead shade are especially important.
• Mixing with incompatible tank mates. Any fish large enough to eat them is a risk, and active, food-competitive species will outcompete them at feeding time. Keep the community small and peaceful.

Where to Buy

Neon green rasboras are a specialty species that you won’t typically find at big-box pet stores. They show up occasionally at well-stocked local fish stores, but your most reliable options are online retailers who specialize in nano and rare freshwater species.

Flip Aquatics is a solid source for nano species like the neon green rasbora. They’re known for shipping healthy, well-conditioned fish, and their quality control is consistently good. Dan’s Fish is another excellent option, they stock a wide range of nano and rare species and have a strong reputation for careful packaging and healthy arrivals.

When ordering, buy a group of at least 8-10 at once rather than adding a few at a time. They ship better in larger groups, acclimate more easily, and you’ll see natural behavior much faster when the full school is introduced together. Ask the seller whether the fish are wild-caught or captive-bred if the listing doesn’t specify, captive-bred specimens are hardier and adjust to aquarium life more quickly.

Frequently Asked Questions

Is the neon green rasbora actually a rasbora?

No. Despite the common name, Microdevario kubotai belongs to the family Danionidae and the genus Microdevario, which puts it in the danio lineage rather than with true rasboras. The “rasbora” label is a holdover from older classifications and is just one of many examples in the hobby where common names don’t match current taxonomy. This isn’t just trivia, it’s relevant for care, since this species has different water parameter preferences than many true rasboras.

How many neon green rasboras should I keep?

Keep a minimum of 8, with 10-12 being ideal. In smaller groups, they’ll be timid, hide constantly, and won’t show their best coloring. A proper school gives them confidence and brings out natural behaviors like loose shoaling and minor displays between males. More fish means better behavior, which is one of the core reasons to keep a species like this in the first place.

What makes the neon green rasbora green?

The green coloration comes from specialized pigment cells called iridophores that reflect light and produce structural color. This is similar to how many other iridescent fish produce their colors, it’s not a simple pigment but a light-reflecting mechanism. The intensity of the green is influenced by diet, water quality, lighting, stress level, and mood. Fish that are healthy, well-fed (especially with live and frozen foods), and kept in soft water with appropriate lighting will show the most vibrant green.

Can neon green rasboras live with shrimp?

Yes, adult cherry shrimp and amano shrimp are safe tank mates. Neon green rasboras are too small to bother full-sized shrimp. However, very young shrimp (shrimplets) could potentially be eaten since they’re small enough to fit in the rasboras’ mouths. If you’re breeding shrimp in the same tank, provide dense moss and plant cover to give the baby shrimp hiding spots. This isn’t a species that actively hunts shrimp, but opportunistic snacking on tiny shrimplets is always a possibility with any fish.

Do neon green rasboras need a heater?

It depends on your room temperature. Their range of 68-79°F (20-26°C) includes comfortable room temperature for most homes. If your fishkeeping room consistently stays in the low to mid 70s, you may not need a heater at all. If temperatures drop below 68°F at night or in winter, a small adjustable heater set to around 72-74°F provides a safety net. These are adaptable fish in terms of temperature, which is one of their strengths for nano setups.

Why are my neon green rasboras not very green?

Dull coloring in neon green rasboras is usually caused by one or more of the following: hard water (GH above 10 dGH), high pH (above 7.5), insufficient plant cover, too few fish in the group, poor diet lacking live or frozen foods, harsh lighting with no shade, or recent stress from shipping or a tank change. Check your water parameters against the recommended ranges, improve the diet, add more plants (especially floaters), and give newly added fish at least a week to settle in. The color should improve as conditions are optimized.

Are neon green rasboras good for beginners?

They can be, as long as the beginner is willing to research water parameters and start with a properly cycled tank. The fish themselves aren’t particularly demanding, they’re peaceful, adaptable within their preferred range, and accept a variety of foods. The main challenges are maintaining soft water (which requires RO water blending depending on your tap water) and feeding appropriately sized foods. If you can meet those two requirements, they’re a rewarding species for newer hobbyists who want something visually unique.

How the Neon Green Rasbora Compares to Similar Species

Neon Green Rasbora vs. Emerald Dwarf Rasbora

The Emerald Dwarf Rasbora is more colorful overall with orange fins and blue-green body. The Neon Green Rasbora has a more subtle, stripe-based appeal. Both need groups and stable conditions. For more visual impact, the Emerald Dwarf Rasbora wins. For something subtler and less commonly seen, the Neon Green Rasbora is the pick.

Neon Green Rasbora vs. Phoenix Rasbora

The Phoenix Rasbora is far more dramatic in color but needs softer, more acidic water. The Neon Green Rasbora is easier to keep in a wider range of conditions. If you want maximum color impact and can provide blackwater conditions, go Phoenix. For a more adaptable nano schooler, the Neon Green Rasbora works better.

Closing Thoughts

The neon green rasbora occupies a genuinely unique niche in the freshwater hobby. There are very few species that deliver this kind of vivid, true green coloration, and even fewer that do it in a body small enough for a 10-gallon nano tank. A school of 10 or more in a well-planted aquarium with soft water and subdued lighting creates a visual effect that’s hard to replicate with any other species, it looks like someone scattered tiny glowing emeralds through the plants.

Keep them in soft water, feed them small foods with live and frozen options in the rotation, give them enough plant cover to feel secure, and maintain a proper school size. Do those things and you’ll be rewarded with a tank that stops people in their tracks. In my 25+ years in the hobby, few nano fish deliver as much visual punch per inch as Microdevario kubotai. If you’re building a nano planted tank and want something that nobody else in your fish club is keeping, this is a strong contender.

Looking for more species like this? Check out our full directory to find the right rasbora or danio for your setup.

This guide is part of our Rasboras & Danios: Complete Species Directory. Visit the hub page to explore care guides for all popular rasbora and danio species.

Recommended Video

Check out this video to learn more about rasboras and what makes them great choices for your aquarium:

References

• Microdevario kubotai (Kottelat & Witte, 1999), FishBase
• Microdevario kubotai Profile, Seriously Fish
• Neon Green Rasbora Care Guide, Practical Fishkeeping

Table of Contents

• What Care Guides Get Wrong
• Key Takeaways
• Species Overview
• Classification
• Origin & Natural Habitat
• Appearance & Identification
• Average Size & Lifespan
• Care Guide
• Is It Right for You?
• Tank Mates
• Food & Diet
• Breeding & Reproduction
• Common Health Issues
• Common Mistakes to Avoid
• Where to Buy
• Frequently Asked Questions
• Species Comparison
• Closing Thoughts
• Recommended Video
• References

The exclamation point rasbora is named for the tiny marking on its side that looks like a punctuation mark. You will not see it from across the room. You will see it when you sit in front of your nano tank with good lighting and a dark background, which is exactly how this fish is meant to be kept. It is a dedicated nano species for people who enjoy observation over spectacle.

In a group of fifteen or more in a small, mature tank, exclamation point rasboras school tightly and display a delicate beauty that bigger fish cannot replicate. This guide covers the focused setup they need, because this species rewards people who actually sit down and watch their tank up close.

This is not a fish you buy to impress guests. This is a fish you buy to impress yourself.

Key Takeaways

• Tiny but striking, maxes out at just 0.8 inches (2 cm), with a distinctive dark stripe and spot pattern that resembles an exclamation point
• The most widely available Boraras species thanks to a broader natural range across Thailand, Vietnam, and Cambodia
• Thrives in soft, acidic water with a pH of 5.0 to 7.0 and hardness of 1 to 8 dGH, more flexible than some other Boraras species
• Peaceful nano schooling fish that should be kept in groups of at least 8 to 10 for best color and natural behavior
• Perfect for planted nano tanks as small as 5 gallons (19 liters), dark substrate and tannin-stained water really make the colors pop
• Egg scatterer that can breed in well-maintained tanks, though raising the tiny fry takes patience and very small first foods

Species Overview

Classification

The exclamation point rasbora was described by Maurice Kottelat in 1991 as Rasbora urophthalmoides. When Kottelat established the genus Boraras in 1993 to accommodate miniature rasbora-like cyprinids, this species was transferred into the new genus along with several other micro-sized relatives. The genus name Boraras is an anagram of Rasbora, a clever taxonomic nod to the close relationship between these tiny fish and their larger cousins.

The species name urophthalmoides comes from the Greek “uro” (tail), “ophthalmos” (eye), and “oides” (resembling), a reference to the prominent eye-like spot near the tail. Currently, the genus Boraras contains six recognized species, all of which stay well under 1 inch (2.5 cm). Other popular species in the genus include the chili rasbora (B. Brigittae), dwarf rasbora (B. Maculatus), and phoenix rasbora (B. Merah). Like all rasboras, this species was historically classified under Cyprinidae but has been reclassified into Danionidae based on molecular phylogenetic studies.

Origin & Natural Habitat

The exclamation point rasbora has one of the widest natural ranges in the Boraras genus. While most of its relatives are confined to the Malay Peninsula or individual Indonesian islands, B. Urophthalmoides is found across mainland Southeast Asia, specifically in Thailand (including the Mekong basin), Vietnam, and Cambodia. This broader distribution is a big part of why this species is the most consistently available Boraras in the aquarium trade.

In the wild, these fish inhabit slow-moving or still waters associated with floodplains, rice paddies, peat swamps, and shallow forest streams. The water is typically shallow, warm, and soft with an acidic to neutral pH. Many of these habitats have a substrate of mud, decomposing leaf litter, and organic debris, which stains the water a characteristic tea-brown color from released tannins and humic acids. Vegetation, both submerged aquatic plants and overhanging terrestrial plants, provides shade and cover.

Water movement in these habitats is typically minimal or nonexistent, especially during the dry season when the fish may be confined to shallow pools and ditches. The exclamation point rasbora shares its habitat with other small cyprinids, gouramis, and various invertebrates. The rice paddy connection is particularly interesting, these fish have adapted to a seasonal environment where water levels fluctuate dramatically, and they can thrive in surprisingly shallow water as long as it stays warm and clean.

Understanding this natural environment is key to replicating it in the aquarium. Slow flow, warm temperatures, soft acidic water, dense planting, and leaf litter all mimic the conditions where these fish evolved and bring out their best colors and behavior.

Appearance & Identification

The exclamation point rasbora is a tiny, slender-bodied fish with a translucent to golden-tan base color that can range from pale amber to a warm reddish-orange depending on condition, water chemistry, and diet. In well-maintained soft water with tannins, the overall coloration becomes warmer and more vibrant.

The feature that gives this species its unforgettable common name is the dark lateral marking. A prominent dark stripe runs along the midline of the body, tapering as it moves toward the tail and terminating in a bold, round dark spot at the base of the caudal fin. Together, the stripe and spot create a shape that looks remarkably like an exclamation point, it’s one of the most distinctive field marks of any nano fish. There is also typically a smaller dark marking near the base of the anal fin.

The fins are mostly transparent, sometimes with a faint yellowish or reddish tinge. The body has a slight iridescent sheen under certain lighting conditions, and the eye is proportionally large with a dark pupil and a thin golden iris. While not as intensely red as the chili rasbora, the exclamation point rasbora has a subtle beauty that really comes into its own in a densely planted tank with dark substrate and subdued lighting.

Telling Boraras Species Apart

Mislabeling among Boraras species is common in the trade, so knowing what to look for matters. Here’s how to distinguish the exclamation point rasbora from its closest relatives:

• Exclamation point rasbora (B. Urophthalmoides), dark lateral stripe ending in a round caudal spot (the “exclamation point” pattern); body is golden-tan to amber
• Chili rasbora (B. Brigittae), intense red body with a dark lateral stripe but no distinct round caudal spot; the stripe is bordered by bright red pigment
• Dwarf rasbora (B. Maculatus), ruby-red body with three separate dark blotches (mid-body, anal fin base, caudal peduncle) rather than a continuous stripe
• Phoenix rasbora (B. Merah), reddish body with a dark lateral blotch (not a stripe) flanked by red or orange; often confused with B. Brigittae
• Strawberry rasbora (B. Naevus), single large dark blotch on mid-body; generally less intensely colored than other Boraras
• Micro rasbora (B. Micros), very small with a dark blotch and reduced lateral stripe; the least commonly seen species in the trade

Male vs. Female

Sexing exclamation point rasboras takes a careful eye, but it’s doable once you know what to look for. Females are slightly larger and rounder-bodied than males, especially when carrying eggs, a gravid female will have a noticeably plumper belly. Males are slimmer and may display slightly more intense coloration, particularly along the lateral stripe and around the fins. During spawning condition, males can develop a deeper amber or reddish tone. The differences are subtle, though, and you’ll usually need a group of adults in good condition to compare side by side.

Average Size & Lifespan

The exclamation point rasbora is a true micro fish. Adults max out at about 0.8 inches (2 cm) in total length, with most specimens in home aquariums reaching around 0.6 to 0.7 inches (1.5 to 1.8 cm). They’re one of the smallest fish you can keep in an aquarium, and first-time owners are often surprised by just how tiny they really are in person.

With proper care, stable water parameters, good diet, low stress, exclamation point rasboras can live 3 to 5 years in captivity. That’s a solid lifespan for such a small fish. The key to longevity is consistency. These fish don’t handle big swings in temperature or water chemistry well, and keeping their environment stable goes a long way toward a full, healthy lifespan.

Care Guide

Tank Size

A 5-gallon (19-liter) tank is the minimum for a small school of exclamation point rasboras. These are tiny fish that don’t need a lot of swimming room, but they do need to be kept in groups, and a 5-gallon gives you enough space for a school of 8 to 10 comfortably. If you want a larger group of 15 or more (which really shows off their natural schooling behavior), bump up to a 10-gallon (38-liter) tank.

Nano tanks in the 5 to 10-gallon range are honestly ideal for this species. In a big community tank, these micro fish will get lost and can feel threatened by larger tank mates. A dedicated nano setup lets you really appreciate their subtle beauty and natural behavior up close.

Water Parameters

The exclamation point rasbora prefers soft, acidic water, though it’s a bit more tolerant than some of its Boraras relatives. That 1 to 8 dGH range gives you more flexibility than, say, the dwarf rasbora which really wants ultra-soft water. That said, these fish will look their absolute best and show their strongest coloration in the lower end of these ranges, soft water around 1 to 4 dGH with a pH of 5.5 to 6.5 is the sweet spot.

Captive-bred specimens (which make up most of the supply in the trade) are more adaptable to moderate water conditions than wild-caught fish. Even so, avoid hard, alkaline water if you can. Stability is more important than hitting a perfect number, pick a target within the range and keep it consistent. Weekly water changes of 20 to 25% with matched temperature and chemistry will keep things stable.

Filtration & Water Flow

A gentle sponge filter is the go-to choice for exclamation point rasboras. These fish come from still or barely moving water in the wild, so strong current from a hang-on-back or canister filter is too much for them. A sponge filter powered by a small air pump provides the perfect combination of biological filtration and gentle water movement without blasting these tiny fish around the tank.

If you prefer a small HOB filter, baffle the outflow with a sponge or pre-filter to reduce current. The fish should be able to swim comfortably without constantly fighting against flow. Water changes of 20 to 25% weekly are recommended, use a slow siphon or airline tubing to avoid accidentally sucking up these tiny fish during maintenance.

Lighting

Subdued to moderate lighting works best. In the wild, exclamation point rasboras live in shaded habitats with heavy canopy cover, and they naturally feel more comfortable and display better color under dimmer conditions. If you’re running a planted tank that needs moderate light for plant growth, use floating plants like Amazon frogbit, salvinia, or red root floaters to create shaded areas where the fish can retreat.

Under bright, unshaded lighting, these fish will wash out and may stay hidden. Tannin-stained water from Indian almond leaves or driftwood also helps diffuse light naturally and creates a more comfortable environment that encourages bolder behavior.

Plants & Decorations

A heavily planted tank is the way to go with this species. Dense clusters of fine-leaved plants like Java moss, Christmas moss, Cryptocoryne species, and Rotala rotundifolia provide cover and make the fish feel secure. Floating plants are a must for the shading benefits mentioned above.

Driftwood and Indian almond leaves are excellent additions, they release tannins that soften the water, lower pH slightly, and stain the water a natural tea-brown color that mimics the fish’s wild habitat. Leaf litter (dried Indian almond leaves, oak leaves, or catappa bark) on the substrate adds a natural touch and also provides microorganism growth that the fish will pick at between feedings. Leave some open swimming space in the middle or front of the tank so you can actually watch the school move together.

Substrate

Dark substrate is strongly recommended. A fine, dark sand or aqua soil makes the exclamation point rasbora’s coloration pop dramatically compared to light-colored gravel. Beyond aesthetics, dark substrate also helps reduce light reflected from the bottom of the tank, which keeps the fish calmer and more willing to swim in the open. Active substrates like ADA Amazonia or Fluval Stratum have the added benefit of naturally buffering pH downward, which is a nice bonus for soft-water species like this one.

Is the Exclamation Point Rasbora Right for You?

Before you buy, run through this honest checklist. The Exclamation Point Rasbora is a great fish for the right keeper, but it is not for everyone.

• You have a dedicated nano tank (5-10 gallons) where tiny fish are the stars
• You can use sponge filtration or intake guards. Standard filters will eat these fish
• You want one of the smallest fish in the freshwater hobby
• You can keep a group of 12+ for visible schooling behavior
• Your tank has no fish large enough to eat a 0.8-inch adult
• You enjoy the challenge and reward of keeping micro species

Tank Mates

The exclamation point rasbora is a peaceful, non-aggressive nano fish that should only be housed with other small, gentle species. At 0.8 inches (2 cm) max, anything with a mouth big enough to eat them is a threat. The best communities pair them with other micro fish and small invertebrates that share similar water requirements.

Best Tank Mates

• Chili rasboras, same genus, same care requirements, stunning mixed school of Boraras
• Dwarf rasboras, another Boraras species that shares identical water preferences
• Pygmy corydoras, tiny, peaceful bottom dwellers that won’t compete for space
• Habrosus corydoras, another micro cory that stays small and sticks to the bottom
• Otocinclus catfish, gentle algae eaters that ignore nano fish entirely
• Ember tetras, similar size, peaceful temperament, and preference for soft water
• Celestial pearl danios, small, peaceful, and visually complementary
• Neocaridina shrimp (cherry shrimp), excellent tank mates that add color and help clean up
• Amano shrimp, peaceful algae eaters, though much larger than the fish
• Malaysian trumpet snails, help aerate substrate and clean up uneaten food
• Nerite snails, excellent algae grazers that won’t bother any fish

Tank Mates to Avoid

• Angelfish, way too large and will absolutely eat exclamation point rasboras
• Bettas, can be aggressive and the rasboras may become targets, especially in smaller tanks
• Tiger barbs, fin nippers that are far too active and boisterous for tiny Boraras
• Gourami species (except sparkling gouramis), most are too large and may prey on or stress nano fish
• Cichlids, even small cichlids like rams can be territorial enough to harass or eat these micro fish
• Large catfish, anything that could fit a rasbora in its mouth is a no-go

Food & Diet

The exclamation point rasbora is an omnivore with a strong micropredator streak, in the wild, it feeds primarily on tiny invertebrates, insect larvae, zooplankton, and other microscopic organisms. In the aquarium, the key thing to remember is that this fish has a very small mouth. Standard-sized flakes and pellets are too big. You need to either crush them into a fine powder or use foods specifically designed for micro fish.

A good staple diet includes crushed high-quality flakes or micro pellets like Hikari Micro Pellets. Supplement regularly with frozen foods, baby brine shrimp, cyclops, and daphnia are excellent choices that provide variety and enhance coloration. Live foods like vinegar eels, microworms, and live baby brine shrimp are absolute favorites and make great conditioning food if you’re looking to breed them.

Feed small amounts 2 to 3 times daily rather than one big feeding. These tiny fish have fast metabolisms and do better with frequent small meals. Only offer what the school can consume in about 2 minutes per feeding. Overfeeding is easy to do with nano fish because the food-to-fish size ratio is so different from what most hobbyists are used to.

Breeding & Reproduction

Breeding Difficulty

Moderate. Exclamation point rasboras will spawn in a well-maintained aquarium without much intervention, but successfully raising the fry is the real challenge. The eggs and fry are extremely tiny, and the adults will eat their own eggs and young if given the chance. Deliberate breeding requires some planning and a dedicated setup.

Spawning Tank Setup

Set up a small breeding tank of 2.5 to 5 gallons (10 to 19 liters) with very gentle filtration, a small air-driven sponge filter turned down low is ideal. Fill the bottom with dense clumps of Java moss, spawning mops, or other fine-leaved plants that give the eggs somewhere to fall where the adults can’t easily reach them. Some breeders use a layer of glass marbles or mesh on the bottom to let eggs drop through to safety.

Keep lighting dim or cover the sides of the tank. These fish naturally spawn in shaded, heavily vegetated areas, and subdued conditions help encourage spawning behavior.

Water Conditions for Breeding

Breeding pairs or groups do best in slightly warmer, softer, and more acidic water than normal care parameters:

• Temperature: 78 to 82°F (26 to 28°C)
• pH: 5.0 to 6.0
• Hardness: 1 to 3 dGH

Using RO water or very soft water mixed with a small amount of tap water works well. Adding Indian almond leaves or peat extract to the breeding tank helps lower pH naturally and adds beneficial tannins. The slight shift toward warmer, softer, more acidic conditions signals to the fish that conditions are right for spawning.

Conditioning & Spawning

Condition a small group (2 to 3 pairs) with frequent feedings of live and frozen foods, baby brine shrimp, daphnia, and microworms are all excellent. After a week or two of conditioning, well-fed females will become noticeably plumper with eggs, and males will display more intensely.

Spawning typically happens in the early morning hours. The fish scatter small, non-adhesive eggs among fine-leaved plants or let them fall to the substrate. A female may release anywhere from 10 to 30 eggs per spawning event. Spawning can be easy to miss because the fish are so small and the behavior is subtle, you may not realize spawning has occurred until you spot tiny fry clinging to the glass a few days later.

Egg & Fry Care

Remove the adults after spawning or rely on the dense plant cover and marbles to protect the eggs. The adults will eat any eggs and fry they can find. Eggs typically hatch in 24 to 48 hours depending on temperature. The fry are absolutely minuscule and will remain attached to plants or glass, absorbing their yolk sac for the first 2 to 3 days.

Once free-swimming, the fry need extremely small first foods. Infusoria, paramecium cultures, or commercially available liquid fry food are essential for the first week or two. After that, you can transition to vinegar eels, microworms, and eventually newly hatched baby brine shrimp as the fry grow. Keep the water very clean with small, frequent water changes using matched parameters. Fry are light-sensitive in the early stages, so keep the breeding tank dimly lit.

In heavily planted, well-established tanks with lots of microorganism growth, some fry may survive without intervention, but deliberate breeding with a dedicated setup will give you much better results. Most exclamation point rasboras in the trade are wild-caught, so captive breeding is a worthwhile endeavor that helps reduce pressure on wild populations.

Common Health Issues

Ich (White Spot Disease)

Ich is the most common disease you’ll encounter with any freshwater fish, and exclamation point rasboras are no exception. Look for small white spots on the body and fins, along with flashing (rubbing against objects) and clamped fins. Treat with a gradual temperature increase to 82 to 84°F (28 to 29°C) combined with a half-dose ich medication, these are small, delicate fish and full-strength treatments can be harsh on them. Prevention is the best approach: quarantine new fish and plants before adding them to your display tank.

Bacterial Infections

Poor water quality is the primary driver of bacterial infections in nano fish. Fin rot, mouth fungus, and general bacterial infections can set in quickly when ammonia, nitrite, or nitrate levels spike, and in a small tank, parameters can deteriorate fast. Regular water changes, proper filtration, and avoiding overcrowding are your best defenses. If you spot red streaks, frayed fins, or cotton-like growths, isolate affected fish and treat with an appropriate antibiotic.

Internal Parasites

Wild-caught exclamation point rasboras will carry internal parasites that cause weight loss, hollow belly, and faded coloration despite regular feeding. If newly purchased fish seem to eat but never gain weight, internal parasites may be the culprit. A medicated food containing praziquantel or levamisole can help. Quarantining all new arrivals for 2 to 4 weeks before adding them to your main tank is the single best prevention measure.

Common Mistakes to Avoid

• Keeping too few, a group of 3 or 4 will be stressed and hide constantly. These are schooling fish that need at least 8, and 10 to 15 is better. A proper school is more confident, more active, and shows significantly better coloration.
• Using food that’s too large, standard flakes and pellets won’t work. Crush everything into a fine powder or use micro-sized foods. If the food doesn’t fit in their mouth, they simply won’t eat it, and it’ll just rot and foul the water.
• Too much current, powerful filters blast these tiny fish around the tank. A gentle sponge filter is all you need. If you notice your rasboras constantly hiding or struggling to swim, the flow is too strong.
• Skipping the quarantine, since many exclamation point rasboras are wild-caught, they can carry parasites or diseases. Always quarantine new arrivals for 2 to 4 weeks before adding them to an established tank.

Where to Buy

The exclamation point rasbora is the most widely available Boraras species, which is great news if you’ve had trouble finding other members of the genus. You’ll occasionally find them at well-stocked local fish stores, but online retailers are your most reliable bet for healthy specimens.

Flip Aquatics is a great source for nano fish and often carries Boraras species. Dan’s Fish is another excellent option with a solid reputation for quality freshwater fish. Both ship live fish directly to your door.

Expect to pay around $3 to $5 per fish, depending on the source and whether they’re wild-caught or captive-bred. Since you need a group of at least 8 to 10, budget for picking up the whole school at once, it’s better for the fish and usually more cost-effective with shipping.

Frequently Asked Questions

How many exclamation point rasboras should be kept together?

A minimum of 8 is recommended, but 10 to 15 is ideal. Like all Boraras species, these are schooling fish that feel more secure, display better color, and exhibit more natural behavior in larger groups. A school of 3 or 4 will be stressed, pale, and spend most of their time hiding.

What size tank does an exclamation point rasbora need?

A 5-gallon (19-liter) tank is the minimum for a small school. For a larger group of 15 or more, a 10-gallon (38-liter) tank is more appropriate. These are true nano fish that don’t need large tanks, but they do need enough space for a proper school with room for plants and decorations.

Are exclamation point rasboras easy to care for?

Yes, they’re one of the easier Boraras species to keep. They’re more tolerant of moderate water conditions than some of their relatives, and their care requirements are straightforward, soft-ish water, gentle filtration, small foods, and a planted tank. The main things to watch are using appropriately small food and keeping the water stable.

Can exclamation point rasboras live with shrimp?

Absolutely. Cherry shrimp, Amano shrimp, and other dwarf shrimp are some of the best tank mates for this species. The rasboras are too small to bother adult shrimp, and they share the same preference for planted tanks with gentle filtration. The only caveat is that newborn shrimplets will be eaten, but in a well-planted tank, enough will survive to sustain the colony.

Why is my exclamation point rasbora losing color?

The most common reasons for color loss are stress, hard or alkaline water, bright lighting, and poor diet. Check your water parameters first, these fish color up best in soft, acidic water. Make sure the lighting isn’t too harsh (add floating plants for shade) and that you’re feeding appropriately sized, varied foods. A dark substrate also makes a big difference in how vivid the colors appear.

Can exclamation point rasboras live with bettas?

It’s generally not recommended. While some peaceful bettas might coexist with them, the risk isn’t worth it. Bettas can be unpredictable, and exclamation point rasboras are tiny enough to be harassed or even eaten. If you want to try it, you’d need at least a 10-gallon planted tank with plenty of cover, but there are better tank mate options for both species.

How long do exclamation point rasboras live?

With proper care, exclamation point rasboras live 3 to 5 years in captivity. Stable water conditions, a varied diet, low stress, and keeping them in a proper school all contribute to a longer, healthier lifespan. Sudden parameter swings and poor water quality are the biggest lifespan-shortening factors.

How the Exclamation Point Rasbora Compares to Similar Species

Exclamation Point Rasbora vs. Phoenix Rasbora

The Phoenix Rasbora is slightly larger and much more colorful. If you want maximum visual impact in a nano tank, the Phoenix Rasbora is the better choice. The Exclamation Point Rasbora is for the keeper who appreciates tiny, delicate fish and wants something truly micro.

Exclamation Point Rasbora vs. Neon Green Rasbora

The Neon Green Rasbora is slightly larger and easier to see in a tank. The Exclamation Point Rasbora is the more extreme nano species. Both need stable conditions and groups. For most nano keepers, the Neon Green Rasbora is more practical.

Closing Thoughts

You will not see the marking from across the room. You will see it when you sit down, slow down, and actually watch. That is the point.

The exclamation point rasbora is one of the best entry points into the world of Boraras nano fish. It’s the most widely available species in the genus, it’s slightly more tolerant of water conditions than some of its relatives, and that exclamation point marking is genuinely one of the coolest patterns in the nano fish world. Set up a planted 5 or 10-gallon tank with dark substrate, soft water, some Indian almond leaves, and a school of 10 to 15 of these little guys, you’ll have a setup that rivals tanks ten times its size for visual impact.

If you’re exploring other rasbora and danio species, check out our care guides for the dwarf rasbora, chili rasbora, and emerald dwarf rasbora. Have you kept exclamation point rasboras? Share your experience in the comments below!

This guide is part of our Rasboras & Danios: Complete Species Directory. Visit the hub page to explore care guides for all popular rasbora and danio species.

Recommended Video

Check out our rasbora video for more on these amazing nano fish, including the exclamation point rasbora:

References

• Boraras urophthalmoides (Kottelat, 1991), FishBase
• Boraras urophthalmoides Profile, Seriously Fish
• Exclamation Point Rasbora, Practical Fishkeeping
• Kottelat, M. (1993). “Diagnoses of two new genera and three new species of small fishes from Thailand.”, Ichthyological Exploration of Freshwaters, 4(4): 313-320.

Table of Contents

• Key Takeaways
• Species Overview
• Classification
• Origin & Natural Habitat
• Appearance & Identification
• Average Size & Lifespan
• Care Guide
• Tank Mates
• Food & Diet
• Breeding & Reproduction
• Common Health Issues
• Common Mistakes to Avoid
• Where to Buy
• Frequently Asked Questions
• Closing Thoughts
• Recommended Video
• References
• What Most Care Guides Get Wrong
• Is the Strawberry Rasbora Right for You?
• Species Comparison

The strawberry rasbora develops a warm pinkish-red color that earns its name, but only in mature, soft, acidic water with a large group. Buy six and put them in a new tank with hard water and you will see a pale, stressed fish that looks nothing like the photos. The color is real. It just requires effort to bring out.

In a well-established nano or small planted tank with a group of ten or more, strawberry rasboras are one of the prettiest nano species available. This guide covers how to get the color right, because the strawberry rasbora is named for a color you will only see if you do everything right.

Mature water, soft parameters, dark substrate, big group. Miss any one of those and the strawberry color never shows up.

What Most Care Guides Get Wrong About Strawberry Rasbora

The most common mistake with Strawberry Rasboras is keeping them in groups that are too small. These fish genuinely need eight to twelve to show natural schooling behavior. In my experience working with rasboras at the stores I managed, small groups of three or four spend all their time hiding.

Key Takeaways

• One of the smallest aquarium fish, maxes out at just 0.6 inches (1.5 cm), making it a true micro fish
• Requires very soft, acidic water, pH 4.0-6.5, which rules out most standard community setups
• Best kept in a species-only nano tank, a 5-gallon minimum, but 10 gallons gives you much more room to work with
• Peaceful but extremely delicate, tank mate options are very limited due to size
• Not a beginner fish, demands stable water chemistry and carefully managed conditions

The strawberry only ripens in blackwater. Standard tap water gives you an unripe peach.

Species Overview

Classification

The genus Boraras is a small group of miniature cyprinids containing only six described species, all native to Southeast Asia. The genus name is an anagram of Rasbora, the genus these fish were originally assigned to. All Boraras species are among the smallest freshwater fish in the world, and they share a preference for soft, acidic blackwater habitats.

The species name “naevus” comes from the Latin word for “blemish” or “birthmark,” referring to the prominent dark spot on the body that is a key identifying feature. Boraras naevus was formally described relatively recently in 2011 by Conway and Kottelat, making it one of the newest additions to the genus.

Origin & Natural Habitat

The strawberry rasbora is found exclusively in southern Thailand, specifically in the provinces around the Malay Peninsula region. Their native habitat is peat swamp forests, a type of environment that’s becoming increasingly rare due to agricultural development and deforestation across Southeast Asia.

These peat swamps are unlike anything most aquarists picture when they think of a fish’s natural home. The water is extremely shallow, often just a few inches deep, and stained a deep brown or black from the massive amounts of decomposing leaf litter and organic material on the forest floor. Sunlight barely penetrates the canopy above, keeping the water dimly lit and cool relative to other tropical habitats.

The water chemistry in these swamps is extreme by aquarium standards. We’re talking a pH that can drop below 4.0, that’s roughly as acidic as orange juice. Mineral content is virtually nonexistent, with general hardness often at or near zero. The substrate is a thick mat of fallen leaves, peat, and decaying plant material. There’s very little aquatic vegetation growing in the water itself, but the structure from roots, branches, and leaf litter is dense.

Understanding this habitat is crucial to keeping strawberry rasboras successfully. These aren’t fish that evolved in clean, neutral water with lots of current. They come from still, tannin-rich blackwater conditions that most fishkeepers would consider extreme.

Appearance & Identification

Despite being almost impossibly small, the strawberry rasbora is a genuinely attractive fish. The base body color ranges from a warm reddish-orange to a deep strawberry pink, which, naturally, is where the common name comes from. The intensity of this color varies depending on the fish’s condition, diet, and water quality, but a healthy specimen in good water is surprisingly vibrant for something half an inch long.

The most distinctive feature is the dark blotch or spot on the middle of the body, which is the “naevus” (blemish) the species is named for. This spot is typically oval-shaped and quite prominent relative to the fish’s tiny size. There also be a smaller dark spot near the base of the tail fin. The overall body shape is slender and somewhat elongated for a cyprinid.

The fins are mostly transparent with a slight reddish tint, especially the caudal (tail) fin. Under the right conditions, soft, acidic water with tannins and subdued lighting, the red-orange coloration deepens significantly, and the fish practically glow against a dark background.

It’s worth noting that strawberry rasboras can look quite different depending on their environment. In hard, alkaline water under bright lights, they’ll appear pale and washed out. Put them in the blackwater conditions they evolved in, and it’s like looking at a completely different fish.

Male vs. Female

Sexing strawberry rasboras is tricky given their minuscule size, but there are a few differences you can spot in mature specimens. Females are slightly rounder in the belly, particularly when carrying eggs, and may appear marginally larger overall. Males are slimmer with a slightly more intense red-orange coloration, especially during courtship. These differences are subtle, though, you’ll often need a magnifying glass and good lighting to tell them apart with any confidence.

Average Size & Lifespan

The strawberry rasbora maxes out at around 0.6 inches (1.5 cm) in total length. To put that in perspective, a fully grown adult is barely larger than a grain of rice. This makes it one of the smallest freshwater aquarium fish available in the hobby, only a handful of species are comparably tiny.

Despite their almost unbelievably small size, strawberry rasboras can live 3 to 5 years with proper care. That’s a respectable lifespan for a fish this small. The key to reaching the upper end of that range is maintaining the stable, soft, acidic water conditions they need and providing a stress-free environment without oversized or aggressive tank mates.

Care Guide

Tank Size

A 5-gallon (19-liter) tank is the minimum for a small group of strawberry rasboras, but I’d recommend starting with a 10-gallon (38-liter) tank if you can. Here’s why: the bigger challenge with these fish isn’t swimming space, it’s water stability. A 5-gallon tank is extremely sensitive to parameter swings, and strawberry rasboras need rock-solid water chemistry. A 10-gallon tank gives you a much larger margin for error, and the extra water volume makes it easier to maintain those low pH and hardness levels consistently.

Keep at least 8-10 individuals. Even though they’re tiny, they’re a shoaling species that feels much more secure in larger groups. In a school of fewer than 6, they’ll spend most of their time hiding and you’ll barely see them.

Water Parameters

This is where strawberry rasboras get demanding. That pH range of 4.0-6.5 is not a typo, these fish genuinely come from some of the most acidic freshwater habitats on the planet. Most community tank setups run a pH of 7.0 or higher, which is well outside what strawberry rasboras can tolerate long-term.

To achieve these conditions, you’ll likely need to use RO (reverse osmosis) water or very soft tap water remineralized to minimal levels. Indian almond leaves, peat moss, alder cones, and driftwood all help lower pH naturally while releasing beneficial tannins. Some keepers use peat filtration or commercially available blackwater extracts to maintain the acidic conditions these fish require.

Temperature-wise, they actually prefer slightly cooler water than many tropical fish. A range of 72-76°F (22-24°C) is ideal for everyday keeping. They can handle warmer temperatures up to 79°F (26°C), but they seem most active and colorful in the lower to middle part of their range.

Filtration & Water Flow

Very gentle filtration is essential. Remember, these fish come from nearly still peat swamps, any significant current will exhaust them and cause chronic stress. A small sponge filter is the gold standard here. It provides biological filtration, creates minimal flow, and is safe for both adults and any fry that might appear.

If you’re using a hang-on-back or internal filter, baffle the output significantly. These are half-inch fish, even moderate flow will push them around. Water changes should be small and frequent. Aim for 10-15% weekly, using pre-conditioned water that matches the tank’s temperature and chemistry as closely as possible. Large water changes with parameter swings are one of the fastest ways to lose strawberry rasboras.

Lighting

Dim lighting is strongly preferred. In the wild, the dense canopy above peat swamp forests blocks most sunlight, and the tannin-stained water absorbs whatever light does get through. Strawberry rasboras are most comfortable and show their best colors under subdued lighting conditions.

Floating plants are your best friend here. Salvinia, Amazon frogbit, dwarf water lettuce, or red root floaters all do a great job of diffusing overhead light while adding a natural feel. If you’re running a planted tank, use low-light species that don’t require intense illumination, this keeps both the plants and the fish happy.

Plants & Decorations

Dense planting is highly recommended. Java moss, Cryptocoryne species (which thrive in acidic water), Java fern, and Bucephalandra all work well in the low-pH conditions strawberry rasboras need. Create plenty of hiding spots with dense plant clusters, but leave some open swimming space in the center or front of the tank.

Driftwood is practically mandatory. It provides structure, releases tannins that help maintain acidity, and creates the type of natural cover these fish feel secure around. Go heavy on the botanicals, dried Indian almond leaves (catappa leaves), alder cones, and seed pods on the substrate replicate their natural peat swamp habitat beautifully. As a bonus, decomposing leaves support colonies of microorganisms that strawberry rasboras will graze on throughout the day.

Substrate

A dark, fine-grained substrate works best. Dark sand or an active planted tank substrate (which can help buffer pH lower) are both good choices. The dark background makes the reddish-orange coloration of the fish pop dramatically. Avoid anything sharp or coarse, these are incredibly delicate fish with tiny mouths that may pick at the substrate surface.

A layer of dried leaves over the substrate adds another layer of authenticity and function. The leaves provide cover, tint the water, and become a feeding ground for the microfauna that strawberry rasboras snack on between meals.

Tank Mates

Best Tank Mates

Let me be direct here: a species-only tank is the safest and easiest approach for strawberry rasboras. At 0.6 inches (1.5 cm), these fish are small enough to be eaten by almost anything with a mouth big enough to fit them. Even “peaceful” community fish like neon tetras can be a threat to something this tiny.

That said, if you want to add some diversity, here are the only tank mates I’d consider:

• Other Boraras species, chili rasboras (B. Brigittae), least rasboras (B. Urophthalmoides), and exclamation point rasboras (B. Urophthalmoides) are similar in size and share the same water requirements
• Small Corydoras species, pygmy corydoras (Corydoras pygmaeus) and dwarf corydoras (C. Hastatus) are gentle enough and stay small
• Otocinclus catfish, peaceful algae eaters that ignore tiny fish entirely
• Small shrimp, neocaridina shrimp (cherry shrimp) or caridina shrimp (crystal reds, if your water is soft enough, which it likely will be)
• Small snails, nerite snails, ramshorn snails, and Malaysian trumpet snails are all safe choices

Tank Mates to Avoid

• Most tetras, even small species like neon tetras are large enough to bully or eat strawberry rasboras
• Bettas, too large and too likely to view them as food
• Any cichlid, even dwarf cichlids like Apistogramma will happily snack on fish this small
• Barbs of any size, too active, too large, and too nippy
• Larger rasboras, harlequin rasboras and similar species are giants by comparison
• Gouramis, even small species like sparkling gouramis may prey on them
• Any fast-moving or aggressive species, strawberry rasboras will be outcompeted for food and stressed constantly

Food & Diet

Feeding strawberry rasboras requires some adjustment from how you’d feed most aquarium fish. Their mouths are extraordinarily small, we’re talking about a fish that’s barely half an inch long. Standard flake food is simply too large for them to eat unless it’s been crushed into a fine powder.

The best staple foods are micro-sized options: micro pellets designed for nano fish, finely crushed high-quality flake food, or powdered foods like Hikari First Bites. These should be small enough for their tiny mouths to handle.

Where strawberry rasboras really shine is with live and frozen micro foods. Vinegar eels, microworms, Walter worms, Grindal worms, baby brine shrimp (BBS), cyclops, and daphnia nauplii are all excellent choices. Live foods trigger a strong feeding response and help bring out the best coloration. If you can culture your own live foods, you’ll see a noticeable difference in how vibrant and active these fish become.

Feeding frequency: Feed small amounts once or twice daily. Only offer what they can consume in about a minute. Overfeeding in a small nano tank fouls the water rapidly, and deteriorating water quality is one of the biggest threats to these sensitive fish.

Pro tip: A well-established tank with plenty of leaf litter and botanicals will develop biofilm and microfauna colonies that strawberry rasboras graze on throughout the day. This supplemental natural food source is one of the reasons a mature, heavily planted tank works so much better for these fish than a newly set up one.

Is the Strawberry Rasbora Right for You?

Before you add a Strawberry Rasbora to your tank, here is an honest assessment of what you’re signing up for. I’d rather you know exactly what to expect now than find out the hard way after you’ve already bought one.

• Experience level: Strawberry Rasboras are best suited for intermediate to advanced keepers. They have specific requirements that can overwhelm beginners.
• Tank size commitment: You’ll need at least 10 gallons, though bigger is always better. Make sure you have room for the tank before buying.
• Tank mate planning: Strawberry Rasboras can be territorial, so plan your community carefully. Not every fish will work as a tank mate.
• Maintenance demands: Expect regular water testing and consistent water changes. Strawberry Rasboras are sensitive to parameter fluctuations.
• Cost to keep: Strawberry Rasboras are reasonably affordable. Standard equipment and quality food cover most needs.
• Time investment: Beyond daily feeding and weekly maintenance, regular observation is the best way to catch health issues early.
• Long-term commitment: With proper care, Strawberry Rasboras can live up to 5 years. Make sure you’re ready for years of consistent care.

Breeding & Reproduction

Strawberry rasboras are egg scatterers, and while breeding them is possible in captivity, it requires some patience and attention to detail.

Breeding Difficulty

Moderate to difficult. They’ll spawn readily enough in the right conditions, but raising the fry is where the real challenge lies. The eggs and fry are microscopic, and the adults will eat both eggs and fry if given the opportunity.

Spawning Tank Setup

A small breeding tank of 2.5-5 gallons (10-19 liters) works well. Fill the bottom with clumps of Java moss or fine-leaved plants like Taxiphyllum species, which give the eggs somewhere to land where the adults can’t easily reach them. Keep the tank dimly lit, both eggs and fry are very light-sensitive.

A bare-bottom tank with a mesh divider works as an alternative. The mesh should be fine enough to let eggs fall through but prevent adults from reaching them below.

Water Conditions for Breeding

The breeding tank water should match their preferred acidic conditions closely. Aim for a pH of 5.0-6.0, temperature around 76-79°F (24-26°C), and near-zero hardness. Use RO water with peat filtration or Indian almond leaf extract to achieve these parameters. An air-powered sponge filter set to the gentlest possible flow is all the filtration you need.

Conditioning & Spawning

Condition breeding pairs or small groups with plenty of live foods, baby brine shrimp, microworms, and daphnia nauplii are ideal. When females are visibly plump with eggs, introduce a conditioned pair or a small group (2-3 males, 2-3 females) into the spawning tank. Spawning typically occurs in the morning. Boraras species will scatter small numbers of eggs among plants over several days rather than producing a single large spawn event.

Egg & Fry Care

Remove the adults after spawning is observed, as they will eat any eggs and fry they find. Eggs are extremely small and may take 24-48 hours to hatch. The fry are absolutely minuscule, you’ll need a magnifying glass to even see them in the first few days.

Feed the fry infusoria, paramecium, or commercially available liquid fry food for the first 1-2 weeks. Once they’re large enough (which takes a while given the tiny starting size), graduate to vinegar eels, microworms, and eventually freshly hatched baby brine shrimp. Growth is slow, don’t expect them to reach adult size for several months. Keep the rearing tank dim and maintain pristine water quality with very gentle, frequent water changes.

Common Health Issues

Strawberry rasboras are healthy fish when kept in proper conditions, but their tiny size makes them fragile when things go wrong. Problems will escalate quickly in small bodies.

pH Shock & Osmotic Stress

This is the number one killer of strawberry rasboras. Because they require such extreme water conditions (very low pH, near-zero hardness), any sudden shift in water chemistry can be fatal. Moving them from soft, acidic water to harder, more alkaline conditions, or vice versa, causes osmotic stress that these tiny fish simply can’t recover from. Always acclimate new arrivals extremely slowly, using drip acclimation over 1-2 hours minimum.

Ich (White Spot Disease)

Strawberry rasboras can contract ich, especially during the stress of transport and acclimation to a new tank. The white spots are visible even on such a small fish. Treatment requires caution, these are sensitive fish, so use half-dose medications or, better yet, raise the temperature gradually to 82°F (28°C) and add a small amount of aquarium salt (if the low pH allows it). Some keepers prefer heat treatment alone for Boraras species.

Internal Parasites

Wild-caught strawberry rasboras may carry internal parasites. Symptoms include a sunken belly, lethargy, and loss of color despite good water conditions. Quarantining new arrivals for at least two weeks is essential. Treat suspected cases with food soaked in an anti-parasitic medication, using the smallest effective dose.

General Prevention

Prevention is everything with strawberry rasboras. Quarantine all new fish, maintain stable water parameters (stability matters even more than hitting exact numbers), and avoid overfeeding. Indian almond leaves and other botanicals in the tank release mild antifungal and antibacterial compounds that help keep these fish healthy naturally. The tannin-rich water they prefer is actually mildly antimicrobial, another reason to embrace the blackwater approach.

Common Mistakes to Avoid

• Putting them in a standard community tank, This is the most common mistake by far. Strawberry rasboras are not community fish. They’re too small, too fragile, and need water chemistry that most community fish can’t tolerate. A species-only nano setup or a tank with only the smallest, gentlest tank mates is the way to go.
• Ignoring water chemistry, You cannot keep these fish in hard, alkaline tap water and expect them to survive long-term. They need soft, acidic conditions. If your tap water is hard, you’ll need RO water or another method to bring the parameters in line.
• Keeping too few, A group of 3-4 strawberry rasboras will be shy, stressed, and constantly hiding. Get at least 8-10 to see natural shoaling behavior and confident, colorful fish.
• Large water changes with mismatched parameters, A 50% water change in a nano tank with water that’s even slightly different in pH or temperature can be catastrophic. Stick to small, frequent changes with pre-conditioned, matched water.
• Feeding standard-sized food, Regular flake food is too large. You need micro-sized foods or finely crushed alternatives. Live micro foods are the gold standard.
• New tank syndrome, Setting up a brand new tank and immediately adding strawberry rasboras is a recipe for disaster. These fish do much better in mature, established tanks with stable biology and natural biofilm to graze on.

Where to Buy

Strawberry rasboras are not as widely available as some of the more common Boraras species like chili rasboras, but they do appear in the hobby through specialty retailers and online sellers. You’re unlikely to find them at big box pet stores, this is a fish you’ll need to source from dedicated aquarium shops or order online.

I recommend checking Flip Aquatics and Dan’s Fish for availability. Both specialize in quality freshwater fish and are reliable sources for nano species like Boraras. When ordering, be aware that shipping tiny, sensitive fish in extreme temperatures (summer heat or winter cold) carries additional risk. Time your orders for mild weather when possible, and opt for overnight or express shipping.

Expect to pay a bit more per fish than you would for common rasboras, typically $4-8 per fish depending on the source and availability. Buy a group of 8-10 at once rather than adding them one or two at a time.

Frequently Asked Questions

How many strawberry rasboras should be kept together?

A minimum of 8-10 is recommended, though more is always better. Strawberry rasboras are a shoaling species that become visibly stressed, shy, and pale in small groups. In a proper school of 10+, they feel secure, display bolder colors, and engage in fascinating natural behaviors including sparring displays between males.

What size tank does a strawberry rasbora need?

A 5-gallon (19-liter) tank is the minimum, but a 10-gallon (38-liter) tank is strongly preferred. The extra water volume provides much better parameter stability, which is critical for a species that requires very specific and extreme water chemistry. The larger tank also gives you room for a school of 10+ without overcrowding.

Are strawberry rasboras good for beginners?

No, not really. While they’re peaceful and don’t require a large tank, their need for very soft, acidic water (pH 4.0-6.5) and their extreme sensitivity to parameter changes make them a poor choice for someone new to the hobby. They’re best suited for intermediate to advanced keepers who are comfortable working with RO water, botanicals, and maintaining stable nano tank conditions.

Can strawberry rasboras live with shrimp?

Yes, adult neocaridina (cherry) shrimp are safe with strawberry rasboras. The fish are too small to eat adult shrimp, and both species are peaceful. If your water is very soft and acidic, caridina shrimp like crystal reds may actually be a better match since they prefer similar conditions. Baby shrimp (shrimplets) are likely safe too, given how small the rasboras’ mouths are.

What’s the difference between strawberry rasboras and chili rasboras?

Both are Boraras species of similar size, but they’re distinct species with different markings. Chili rasboras (Boraras brigittae) have a dark lateral stripe running along the body with a red stripe above it, while strawberry rasboras (Boraras naevus) have a prominent dark spot (blotch) on the body rather than a stripe. Chili rasboras are from Borneo, while strawberry rasboras are from southern Thailand. Care requirements are similar for both species.

Do strawberry rasboras need a heater?

It depends on your room temperature. Strawberry rasboras tolerate a temperature range of 68-79°F (20-26°C), which is cooler than many tropical fish. If your home stays consistently above 68°F (20°C), you may not need a heater. However, a small adjustable heater set to the low-to-mid 70s provides stability and prevents dangerous overnight temperature drops, especially in a small nano tank that loses heat quickly.

Why are my strawberry rasboras hiding all the time?

The most common causes are too few fish in the group, inadequate cover, or overly bright lighting. Strawberry rasboras need a school of at least 8-10 to feel secure. Make sure the tank has plenty of plants, floating plants to dim the light, and botanical cover like leaves and driftwood. Also check for aggressive tank mates, even a single fish that’s too large or active can keep the entire school in hiding.

How the Strawberry Rasbora Compares to Similar Species

If you’re considering a Strawberry Rasbora, you’ve probably also looked at the Chili Rasbora. Both fill similar roles, but the differences matter when planning your tank. The Strawberry Rasbora has its own distinct personality and care needs. In my experience, the choice often comes down to the specific community you’re building and whether your water parameters favor one over the other.

The Dwarf Rasbora is worth considering as well. While the Strawberry Rasbora and the Dwarf Rasbora share some overlap in care, they bring different energy to a tank. If you have the space, keeping both in separate setups gives you a great chance to compare their behavior firsthand.

Closing Thoughts

The strawberry rasbora in hard, alkaline water is a pale, forgettable fish. In soft, acidic water, it turns into the fish you built the tank for.

The strawberry rasbora is a specialist fish for a specialist setup, and that’s part of what makes it so rewarding. Building a blackwater nano tank around these micro fish is a genuinely different experience from maintaining a standard community aquarium. When you get the conditions right and see a school of 10+ strawberry rasboras swimming through tannin-stained water over a carpet of leaf litter, glowing that deep strawberry red, it’s something special.

They’re not for everyone, and they’re definitely not a fish you should impulse-buy without doing your homework first. But if you’re willing to put in the effort to create the acidic, soft-water environment they need, strawberry rasboras will reward you with years of color and personality in one of the tiniest packages in the hobby.

If you’re interested in other nano rasbora species, check out our Rasboras & Danios species directory for more care guides on Boraras and other small rasbora species.

This guide is part of our Rasboras & Danios: Complete Species Directory. Visit the hub page to explore care guides for all popular rasbora and danio species.

Recommended Video

Check out our rasbora species video for an overview of some of the best rasboras in the hobby, including the strawberry rasbora:

References

• Boraras naevus Profile, Seriously Fish
• Boraras naevus (Conway & Kottelat, 2011), FishBase
• Boraras: The World’s Tiniest Aquarium Fish, Practical Fishkeeping
• Boraras naevus, The Aquarium Wiki

Table of Contents

• What Care Guides Get Wrong
• Key Takeaways
• Species Overview
• Classification
• Origin & Natural Habitat
• Appearance & Identification
• Average Size & Lifespan
• Care Guide
• Is It Right for You?
• Tank Mates
• Food & Diet
• Breeding & Reproduction
• Common Health Issues
• Common Mistakes to Avoid
• Where to Buy
• Frequently Asked Questions
• Species Comparison
• Closing Thoughts
• Recommended Video
• References

The Brilliant Rasbora grows to nearly 4 inches, making it one of the largest rasboras. It needs a tank that matches its size, not the nano setups most people associate with rasboras. A group of six in a 30-gallon minimum is where this species belongs. Undersize the tank and you get stressed, pale fish that never display their namesake brilliance.

What Most Care Guides Get Wrong About the Brilliant Rasbora

The Brilliant Rasbora is a classic case of a fish that is brilliant in name but only occasionally brilliant in practice. The misconception is that it always looks shiny and metallic. In reality, the iridescence is angle-dependent and lighting-dependent. Under direct LED light, it can look almost plain. With side lighting and a dark background, it genuinely sparkles. The other mistake is keeping them in tanks that are too small. This is a moderately sized rasbora (3-4 inches) that needs swimming room and a proper school.

What makes the brilliant rasbora stand out among rasboras is its size and toughness. At up to 2 inches (5 cm), it’s one of the larger true Rasbora species, which gives it more presence in a community tank than the smaller micro rasboras that dominate the hobby right now. It’s also incredibly hardy and tolerant of a wide range of water conditions, making it an excellent choice for beginners and experienced hobbyists alike. Let me walk you through everything you need to know about keeping this underrated fish.

Key Takeaways

• Minimum tank size is 15 gallons (57 liters) for a school of 6, but a 20-gallon long with 10+ fish really shows off their schooling behavior
• Extremely hardy and adaptable, tolerates pH from 6.0 to 8.0 and a wide hardness range, making it forgiving for beginners
• Peaceful schooling fish, safe with virtually any community tank mate that won’t eat them
• Omnivore, eagerly accepts flakes, pellets, and frozen foods with no fuss
• Also known as the Blackline Rasbora or Red-tailed Rasbora, named for the distinctive black lateral stripe and colorful caudal fin

Species Overview

Classification

The genus Rasbora is one of the largest cyprinid genera, containing dozens of species distributed across Southeast Asia. Unlike many of the smaller “rasboras” that have been reclassified into genera like Trigonostigma, Boraras, and Sundadanio over the years, the brilliant rasbora remains a true Rasbora in the traditional sense.

The species was first described by Hugh McCormick Smith in 1934 from specimens collected in Bung Borapet, a large freshwater swamp lake in Nakhon Sawan Province, Thailand. That’s where the species name borapetensis comes from. It’s a member of the family Danionidae (previously grouped under Cyprinidae in older references), which also includes danios and many other small cyprinids popular in the aquarium hobby.

Origin & Natural Habitat

The brilliant rasbora is native to mainland Southeast Asia, with a range that covers Thailand, Laos, Cambodia, and peninsular Malaysia. It’s most commonly associated with the Mekong and Chao Phraya river basins in Thailand, but populations are found across a broad geographic area.

In the wild, these fish inhabit slow-moving streams, marshes, ponds, and flooded fields. They’re often found in relatively shallow, still or gently flowing water with plenty of aquatic vegetation. Unlike many popular rasbora species that come from blackwater forest streams, the brilliant rasbora will occupy more open habitats, rice paddies, irrigation canals, and the margins of larger water bodies. These environments often have neutral to slightly alkaline water, which explains why this species is so adaptable to a wide range of pH levels in captivity.

The substrate in their natural habitat is typically muddy or silty, and vegetation ranges from dense aquatic plants to sparse emergent grasses depending on the season. Southeast Asian freshwater habitats are often subject to significant seasonal changes in water level and flow, so the brilliant rasbora has evolved to handle fluctuating conditions, a trait that translates directly into hardiness in the home aquarium.

Most brilliant rasboras sold in the trade are either wild-caught from Thailand or commercially bred in Asian fish farms. Unlike some rasbora species that are difficult to breed commercially, R. Borapetensis breeds readily in captivity.

Appearance & Identification

The brilliant rasbora has a sleek, elongated body shape that’s more streamlined than many of the deeper-bodied rasbora species. The base coloration is a silvery-olive tone across the upper body, fading to a lighter silver-white on the belly. But what really defines this fish visually are two key features: the bold black lateral stripe and the bright red-orange tail.

The black stripe runs along the entire length of the body from the tip of the snout to the base of the caudal fin. It’s clean, well-defined, and immediately catches the eye, this is where the “Blackline Rasbora” common name comes from. Just above this dark stripe, you’ll often notice a thin gold or iridescent line that adds a subtle shimmer, especially when the light catches it at the right angle.

The caudal (tail) fin is where this fish really earns the “brilliant” and “red-tailed” parts of its common names. The base of the tail displays a vivid patch of red, orange, or golden-yellow coloring that contrasts sharply with the black stripe. In healthy, well-kept specimens, this color is intense. The dorsal fin also shows a faint reddish tinge at its base. All other fins are mostly transparent.

Overall, it’s a clean and elegant look. Not as flashy as a neon tetra or a celestial pearl danio, but there’s a classic simplicity to the brilliant rasbora that grows on you. A tight school of 10 or more moving through a planted tank is genuinely striking.

Male vs. Female

Sexing brilliant rasboras isn’t especially difficult once the fish are mature. Females are slightly larger and noticeably fuller-bodied, particularly when carrying eggs, they develop a rounder belly profile that’s easy to spot from above. Males are slimmer and more streamlined, and they often display slightly more intense coloration in the tail fin. The differences are subtle in younger fish but become more apparent as they reach full size.

Average Size & Lifespan

Brilliant rasboras reach a maximum size of about 2 inches (5 cm) in total length, making them one of the larger species in the genus Rasbora commonly kept in aquariums. This extra size compared to micro rasboras like Boraras species gives them more visual presence in a community setup and makes them less vulnerable to predation by slightly larger tank mates.

In captivity, expect a lifespan of 3 to 5 years with proper care. Consistent water quality, a varied diet, and a stress-free environment with enough schooling companions all contribute to reaching the upper end of that range. As with most small cyprinids, genetic quality matters too, buying from reputable sellers will result in healthier, longer-lived fish.

Care Guide

Tank Size

A 15-gallon (57-liter) tank is the minimum for a small school of 6 brilliant rasboras, but I’d strongly suggest going with a 20-gallon long if your space and budget allow it. These are active swimmers that appreciate horizontal swimming room, and a longer tank lets a school of 10 or more display natural schooling behavior that’s simply not possible in a smaller footprint.

Because they spend most of their time in the middle water column, a tank with more length and width matters more than height. The 20-gallon long format is ideal, it gives them plenty of room to cruise back and forth while still being manageable for most fishkeepers.

Water Parameters

One of the biggest selling points of the brilliant rasbora is its flexibility with water chemistry. That pH range of 6.0 to 8.0 is genuinely broad, you don’t need to chase soft, acidic conditions to keep this fish happy. If your tap water comes out at 7.5 with moderate hardness, the brilliant rasbora will do just fine without any adjustments. That’s a real advantage over species like chocolate gouramis or certain wild-caught rasboras that demand specific water chemistry.

Temperature-wise, they prefer the lower to mid-70s, which is slightly cooler than many tropical fish. This actually makes them a good match for species like white cloud mountain minnows or certain danios that prefer temperatures below 80°F (27°C). As always, stability matters more than hitting a perfect number, keep your parameters consistent and avoid sudden swings.

Filtration & Water Flow

Brilliant rasboras come from slow-moving to still water, so gentle filtration is the way to go. A sponge filter works well for smaller setups and is the safest option if you have fry in the tank. For larger aquariums, a hang-on-back filter or canister filter with a spray bar to diffuse the output will keep things clean without creating too much current.

Weekly water changes of 20-25% are a good baseline. These are relatively low-bioload fish, but regular maintenance keeps nitrates in check and ensures stable conditions. If you’re running a heavily planted tank, the plants will help with nutrient uptake, but that doesn’t replace consistent water changes.

Lighting

The brilliant rasbora isn’t particularly demanding when it comes to lighting. They look good under moderate lighting, which conveniently lines up with what most planted tanks run. Unlike some species that wash out under bright lights, brilliant rasboras maintain their coloring reasonably well across different lighting levels.

That said, they do will show more confidence and natural behavior when there are some shaded areas in the tank. Floating plants create dappled light patterns that give the fish zones to retreat to when they want a break from brighter areas. The contrast of light and shadow also makes the black lateral stripe and red tail pop a bit more visually.

Plants & Decorations

A planted tank is the ideal setup for brilliant rasboras. They come from vegetated habitats in the wild, and live plants provide the security and visual barriers that help them feel at home. Java fern, Vallisneria, Cryptocoryne species, and stem plants like Rotala or Hygrophila all work well. Dense planting along the back and sides with open swimming space in the center is a layout that looks great and functions perfectly for this species.

Driftwood and smooth rocks add structure and create natural-looking boundaries in the aquascape. If you want to go for a Southeast Asian biotope look, combine driftwood, Java fern, and a sandy substrate, it’s simple but effective. Indian almond leaves or other dried botanicals can be added for a more natural aesthetic and the mild tannin release, though this species doesn’t require blackwater conditions.

Substrate

Brilliant rasboras aren’t picky about substrate since they spend their time in the mid-water column rather than near the bottom. Fine sand or a quality planted tank substrate both work well. A darker substrate will bring out the best coloration in most fish, and the brilliant rasbora is no exception, the black stripe and red tail look sharper against a dark background than over bright white gravel.

If you’re going for a natural biotope look, fine sand or a sand-and-gravel mix mimics the muddy and silty substrates of their native Southeast Asian habitats.

Is the Brilliant Rasbora Right for You?

Before you buy, run through this honest checklist. The Brilliant Rasbora is a great fish for the right keeper, but it is not for everyone.

• You have a 30-gallon or larger tank for a school of 3-4 inch rasboras
• You enjoy iridescent fish that catch the light from different angles
• You can keep a group of 6-8+ for proper schooling
• Your tank has side lighting or angled lighting that shows off iridescence
• You want a peaceful, hardy species for a mid-sized community
• You appreciate a classic rasbora that looks much better in person than in photos

Tank Mates

The brilliant rasbora is a genuinely peaceful fish that gets along with just about anything that won’t try to eat it. Their slightly larger size compared to micro rasboras makes them compatible with a wider range of community fish.

Best Tank Mates

• Corydoras catfish, peaceful bottom dwellers that complement mid-level rasboras perfectly
• Harlequin rasboras, a natural pairing, similar temperament and overlapping native range
• Ember tetras, small, peaceful, and the warm orange tones pair nicely with the brilliant rasbora’s red tail
• Kuhli loaches, gentle bottom dwellers that add activity to the lower tank level
• Cherry barbs, another peaceful Southeast Asian species that works well in the same conditions
• Dwarf gouramis, a colorful centerpiece fish that won’t bother rasboras
• Otocinclus catfish, non-threatening algae eaters perfect for community setups
• Neon and cardinal tetras, the blue tones contrast beautifully with the rasbora’s warm reds
• Cherry shrimp, brilliant rasboras are safe with adult shrimp, though very small shrimplets will be at risk
• White cloud mountain minnows, another hardy, cooler-water species that overlaps well in temperature preference

Tank Mates to Avoid

• Large cichlids, any fish big enough to see a 2-inch rasbora as a snack
• Tiger barbs, too nippy and boisterous for peaceful rasboras
• Angelfish, they may eat brilliant rasboras as they grow larger
• Red tail sharks, territorial and prone to chasing small schooling fish
• Aggressive or highly territorial species, anything that will stress out or outcompete the rasboras for food

Food & Diet

Brilliant rasboras are easy-going omnivores that accept pretty much anything you offer. In the wild, they feed on small insects, worms, crustaceans, and plant matter. In the aquarium, they’ll eagerly take flake food, micro pellets, and freeze-dried options as a daily staple.

To keep them in peak color and health, supplement their base diet with frozen or live foods a few times per week. Daphnia, brine shrimp, bloodworms, and cyclops are all great choices. You’ll notice the red-orange coloring in the tail becomes more vivid when they’re getting a varied, high-quality diet, color-enhancing foods with carotenoids make a real difference.

Feeding frequency: Once or twice daily, in small amounts they can consume within 2-3 minutes. These are active fish, but they have small mouths and stomachs, small, frequent meals are better than one large feeding.

Tip: Brilliant rasboras prefer to eat in the middle water column. Slow-sinking foods or flakes that stay suspended briefly work best. If you’re keeping them with bottom feeders like corydoras, the cories will clean up anything that makes it to the substrate.

Breeding & Reproduction

Brilliant rasboras are egg scatterers that can be bred in captivity, though they require a bit more effort to spawn consistently compared to some of the easier danio species.

Breeding Difficulty

Moderate. They’re not the hardest cyprinid to breed, but they do need specific conditions to trigger spawning, and the eggs and fry require attention. If you’ve bred other egg-scattering cyprinids or tetras, you should be able to manage this species.

Spawning Tank Setup

Set up a separate breeding tank of 10-15 gallons (38-57 liters). Line the bottom with clumps of fine-leaved plants like Java moss or spawning mops, these give the eggs somewhere to settle and provide some protection from the adults. Alternatively, use a mesh or grid on the bottom that allows eggs to fall through while keeping the parents from reaching them. Like most egg scatterers, brilliant rasboras will readily eat their own eggs if they can get to them.

Keep the lighting dim in the breeding tank. A small air-powered sponge filter provides gentle filtration without creating too much current or risking the eggs.

Water Conditions for Breeding

To trigger spawning, aim for soft to moderately soft water with a pH of 6.0-6.5 and hardness around 2-6 dGH. Raise the temperature slightly to 77-79°F (25-26°C). Using RO water mixed with a bit of tap water to hit the target parameters works well. A slight temperature increase combined with a water change will trigger spawning behavior.

Conditioning & Spawning

Condition breeding pairs or small groups separately for 1-2 weeks before spawning attempts. Feed heavily with high-quality live and frozen foods, daphnia, brine shrimp, and bloodworms are ideal. When females look visibly plump with eggs and males are showing intensified colors, introduce a pair or a small group (2 males to 3 females works well) to the breeding tank in the evening. Spawning typically occurs in the early morning hours.

During spawning, the male will chase and display to the female, and the pair will scatter adhesive eggs among the plants or over the substrate. A healthy female can produce several dozen eggs per spawn.

Egg & Fry Care

Remove the adults immediately after spawning is complete, they will consume every egg they can find. Eggs typically hatch within 24-48 hours depending on temperature. The fry will absorb their yolk sac over the next 2-3 days and become free-swimming shortly after.

Feed free-swimming fry with infusoria or commercial liquid fry food for the first several days. Once they’ve grown a bit, transition to microworms and freshly hatched baby brine shrimp (BBS). Keep the tank clean with small, frequent water changes, fry are sensitive to water quality deterioration. Growth is steady, and young fish should begin showing adult coloration within a few months.

Common Health Issues

Brilliant rasboras are a hardy species overall, but like any aquarium fish, they’re susceptible to a few common diseases. Good husbandry prevents most problems.

Ich (White Spot Disease)

The most common ailment for any tropical fish, and brilliant rasboras are no exception. Ich usually appears after temperature fluctuations, stress from shipping, or introduction to a new tank. Look for small white spots on the body and fins, along with flashing (rubbing against surfaces). Raise the temperature gradually to 82°F (28°C) and treat with a standard ich medication. Brilliant rasboras generally handle treatment well.

Fin Rot

Fin rot is almost always a water quality issue. Ragged, fraying, or discolored fin edges are the telltale signs. Improve water quality with more frequent water changes, and treat with an antibacterial medication if the condition doesn’t improve on its own. Caught early, fin rot is usually easy to reverse.

Columnaris

Columnaris (sometimes mistaken for a fungal infection) appears as white or grayish patches on the body or mouth. It’s bacterial and can spread quickly in stressed or overcrowded tanks. Treat promptly with an appropriate antibiotic, and isolate affected fish if possible.

General Prevention

The best medicine is prevention. Quarantine all new fish for at least two weeks before adding them to your display tank. Maintain stable water parameters, keep up with your water change schedule, and avoid overstocking. Brilliant rasboras are tough fish, but they’re not immune to the basics, good water quality is the foundation of fish health.

Common Mistakes to Avoid

• Keeping too few, Brilliant rasboras are schooling fish. Groups under 6 lead to stressed, skittish fish that spend most of their time hiding. Get at least 6, and aim for 10+ if your tank size allows. A proper school behaves completely differently from a few lonely individuals.
• Too much current, These fish come from slow-moving or still water. A powerful filter output blasting through the tank will stress them out and exhaust them. Diffuse your filter output or use a sponge filter for best results.
• Skipping quarantine, Because they’re often available as wild-caught or farm-raised imports, quarantining new brilliant rasboras for 2 weeks is especially important. It gives you time to spot any diseases before they reach your main tank.
• Pairing with aggressive tank mates, They’re peaceful fish that won’t compete well for food or territory against aggressive species. Stick with other community-friendly fish.
• Ignoring the temperature range, Brilliant rasboras prefer slightly cooler conditions (72-79°F) than many tropical species. Keeping them at the upper end of typical tropical temperatures (82°F+) long-term can shorten their lifespan.

Where to Buy

Brilliant rasboras are occasionally available at well-stocked local fish stores, but they’re not as commonly carried as harlequin rasboras or some of the more popular species. You need to ask your LFS to special order them, or shop online for a more reliable supply.

For quality stock shipped directly to your door, I recommend checking Flip Aquatics and Dan’s Fish. Both are reputable online sellers that carry healthy, well-acclimated freshwater fish and ship safely. Buying from a dedicated fish seller rather than a big box chain typically means healthier fish with less stress from the supply chain.

Pricing is reasonable, expect to pay around $3-5 per fish, with discounts often available when purchasing a full school. Given how hardy and long-lived they are, brilliant rasboras are excellent value.

Frequently Asked Questions

How many brilliant rasboras should I keep together?

A minimum of 6, but 10 or more is ideal. Brilliant rasboras are a true schooling species that feel safest and display the best behavior in larger groups. In small numbers, they become shy and stressed, spending most of their time hiding rather than swimming in the open.

Are brilliant rasboras good for beginners?

Yes, they’re an excellent beginner fish. Their wide tolerance for pH (6.0-8.0) and hardness (2-15 dGH) means they’ll adapt to most tap water without the need for special adjustments. They’re hardy, peaceful, easy to feed, and forgiving of the minor mistakes new fishkeepers often make. Just make sure your tank is fully cycled before adding them.

Can brilliant rasboras live with bettas?

, yes. Brilliant rasboras are peaceful and not known as fin nippers, which makes them a safer choice for a betta community than many tetras or barbs. Use at least a 20-gallon tank with plenty of plants and hiding spots, and always monitor the betta’s temperament, some individual bettas are more aggressive than others regardless of tank mates.

What’s the difference between brilliant rasboras and harlequin rasboras?

They’re completely different species. Harlequin rasboras (Trigonostigma heteromorpha) are deeper-bodied with a distinctive black triangular patch and coppery-orange coloring. Brilliant rasboras (Rasbora borapetensis) are more streamlined with a black lateral stripe and red-orange tail. Harlequins are also in a different genus, they were reclassified out of Rasbora years ago. Both are great community fish and actually make excellent tank mates together.

Do brilliant rasboras need a heater?

In most homes, yes. While they tolerate temperatures as low as 72°F (22°C), which is close to room temperature in some climates, a heater ensures stability and prevents dangerous nighttime temperature drops. A consistent temperature within their preferred range is more important than the exact number.

Why is my brilliant rasbora’s color fading?

Faded color in brilliant rasboras is usually caused by stress, poor water quality, a monotonous diet, or keeping too few together. Check your water parameters, make sure you have a proper school of 6+, and supplement their diet with frozen foods like brine shrimp and daphnia. A darker substrate and some planted cover can also help bring out their best coloring.

How long do brilliant rasboras live?

With proper care, brilliant rasboras typically live 3 to 5 years in a home aquarium. Consistent water quality, a varied diet, and a low-stress environment with enough schooling companions all help them reach the upper end of that range.

How the Brilliant Rasbora Compares to Similar Species

Brilliant Rasbora vs. Scissortail Rasbora

Both are medium-sized rasboras that need schools and swimming room. The Scissortail Rasbora is more active and has the signature forked tail movement, while the Brilliant Rasbora has better body iridescence. Both are peaceful and hardy. The Scissortail Rasbora is more commonly available.

Brilliant Rasbora vs. Phoenix Rasbora

These are completely different fish for completely different setups. The Phoenix Rasbora is a tiny nano species; the Brilliant Rasbora is a mid-sized schooler. They cannot really be compared as alternatives. Choose based on your tank size and goals.

Closing Thoughts

The brilliant rasbora is one of those classic community fish that deserves more attention than it gets. It’s hardy, adaptable, peaceful, and genuinely attractive in a planted setup, what more could you ask for? In a hobby that’s increasingly focused on nano fish and rare imports, there’s something refreshing about a species that just works without any drama.

If you’re building a Southeast Asian community tank or just want a reliable schooling fish that won’t give you headaches, the brilliant rasbora belongs on your shortlist. Give them a proper school, decent water quality, and a tank with some plants and open swimming space, and they’ll reward you with years of trouble-free enjoyment.

Looking for more rasbora and danio species to consider? Check out our complete rasboras and danios guide for profiles on dozens of species.

Recommended Video

Check out this video to learn more about rasboras and which species are best for your tank:

References

• Rasbora borapetensis Profile, Seriously Fish
• Rasbora borapetensis (Smith, 1934), FishBase
• Brilliant Rasbora, Practical Fishkeeping
• Rasbora borapetensis, The Aquarium Wiki

Table of Contents

• Key Takeaways
• Species Overview
• Classification
• Origin & Natural Habitat
• Appearance & Identification
• Average Size & Lifespan
• Care Guide
• Tank Mates
• Food & Diet
• Breeding & Reproduction
• Common Health Issues
• Common Mistakes to Avoid
• Where to Buy
• Frequently Asked Questions
• Closing Thoughts
• Recommended Video
• References
• What Most Care Guides Get Wrong
• Is the Dwarf Rasbora Right for You?
• Species Comparison

The dwarf rasbora is one of the smallest fish you can keep in an aquarium, barely reaching three-quarters of an inch. It is not a community fish. Anything big enough to eat it will, and anything active enough to out-compete it for food will. It needs a dedicated nano setup with species-only or carefully chosen tank mates that cannot fit it in their mouth.

In the right nano setup, a group of twenty or more dwarf rasboras is endlessly fascinating. They school tightly, display subtle but beautiful coloration, and bring life to a small tank in a way that no other species can. This guide covers the specific conditions they need, because the dwarf rasbora does not belong in a community tank. It belongs in a dedicated nano setup built around its size.

If your smallest tank mate can eat a dwarf rasbora, it will. Stock accordingly.

What Most Care Guides Get Wrong About Dwarf Rasbora

The most common mistake with Dwarf Rasboras is keeping them in groups that are too small. These fish genuinely need eight to twelve to show natural schooling behavior. In my experience working with rasboras at the stores I managed, small groups of three or four spend all their time hiding.

Key Takeaways

• One of the smallest aquarium fish available, maxes out at just 1 inch (2.5 cm), making it a true nano species ideal for tanks as small as 5 gallons
• Requires soft, acidic water with a pH of 4.0 to 7.0 and hardness of 1 to 5 dGH, this is not a fish for hard, alkaline tap water
• The type species of the Boraras genus, which was split from Rasbora specifically for these miniature fish (the name “Boraras” is an anagram of “Rasbora”)
• Peaceful schooling fish that should be kept in groups of at least 8 to 10 for best color and behavior
• Stunning ruby-red coloration with distinctive dark spots that intensify in soft, tannin-stained water with subdued lighting
• Egg scatterer that can breed in well-maintained planted nano tanks, though raising fry requires dedication and very small first foods

Six dwarf rasboras give you a group. Fifteen give you a reason to watch your tank.

Species Overview

Classification

The dwarf rasbora was originally described by Georg Duncker in 1904 as Rasbora maculata. It was later moved into the genus Boraras when Maurice Kottelat established that genus in 1993 to accommodate a group of miniature species that were clearly distinct from the larger true rasboras. Boraras maculatus serves as the type species for the genus, meaning it’s the species that defines what a Boraras is.

The genus name Boraras is an anagram of Rasbora, which is a clever bit of taxonomic wordplay. It reflects the close relationship between the two genera while signaling that Boraras species are fundamentally different, all of them are miniature fish that stay well under 1 inch (2.5 cm), while true Rasbora species can reach several inches. Currently, the genus Boraras contains six recognized species, including popular nano aquarium fish like the chili rasbora (B. Brigittae), phoenix rasbora (B. Merah), and the least rasbora (B. Urophthalmoides).

Like most rasboras, this species was historically classified under the family Cyprinidae. Molecular phylogenetic studies led to the reclassification of many small cyprinids into the family Danionidae, which is now the accepted placement. You may still see Cyprinidae listed on older reference material, but Danionidae is correct.

Origin & Natural Habitat

The dwarf rasbora is native to Southeast Asia, specifically the southern Malay Peninsula (including parts of Malaysia and Singapore) and the island of Sumatra in Indonesia. It has one of the more restricted natural ranges among commonly kept aquarium fish, though it can be locally abundant within that range.

In the wild, B. Maculatus is found in peat swamp forests, blackwater streams, and heavily shaded pools associated with ancient tropical peatlands. These are extraordinary environments, the water is often stained a deep tea-brown or almost black by humic acids and tannins leaching from thick layers of decomposing organic matter. The pH in these habitats can drop as low as 3.0 to 4.0, and the water is extremely soft with almost no measurable mineral content. Dissolved oxygen levels can be low, and the substrate is typically a deep bed of waterlogged leaves and woody debris.

Light penetration is minimal due to the dense forest canopy overhead and the deeply stained water. The fish share these habitats with other acid-loving species like chocolate gouramis, licorice gouramis, and various other Boraras species. Understanding just how extreme these blackwater conditions are helps explain why the dwarf rasbora does so much better in soft, acidic aquarium water. These fish evolved in water that most fishkeepers would consider impossibly acidic.

It’s worth noting that many of these peat swamp habitats are under serious threat from deforestation, agricultural conversion (particularly oil palm plantations), and peat drainage. Conservation of these ecosystems matters not just for the dwarf rasbora but for the dozens of unique fish species that call them home.

Appearance & Identification

The dwarf rasbora is a tiny, slender-bodied fish with a translucent to semi-translucent base color that ranges from pinkish-red to a deep ruby-red depending on the fish’s condition, water chemistry, and diet. When kept in optimal soft, acidic water with tannins, the red coloration becomes rich and intense. In harder or more alkaline water, the color fades to a washed-out pinkish-orange.

The most distinguishing feature of B. Maculatus is its pattern of dark spots. There are typically three prominent dark markings: one near the base of the anal fin, one on the caudal peduncle (the narrow area just before the tail), and one larger spot on the mid-body near the base of the dorsal fin. These dark blotches are bordered or highlighted by areas of more intense red or orange pigment, creating a striking contrast against the translucent body.

The fins are mostly transparent to slightly reddish, and the eye is relatively large for the body size, with a dark pupil and a thin golden or reddish iris. The overall body shape is torpedo-like but very petite, these are genuinely tiny fish, and seeing them in person for the first time, most people are surprised by just how small they actually are.

Telling Boraras Species Apart

With six species in the genus, Boraras can be confusing, especially since several look similar at first glance and mislabeling in the trade is common. Here’s a quick breakdown of the most commonly available species:

• Dwarf Rasbora (B. Maculatus), Ruby-red body with distinct dark spots (typically three visible). This is the type species for the genus and one of the most widely available.
• Chili Rasbora (B. Brigittae), Deeper, more intense red coloration with a prominent dark lateral stripe running along the body rather than isolated spots. Considered the most vibrantly colored Boraras species.
• Phoenix Rasbora (B. Merah), Similar to the chili rasbora but with a shorter, less defined lateral stripe and more prominent dark spots. The red coloration is slightly more orange-toned.
• Least Rasbora (B. Urophthalmoides), Has a thin dark lateral stripe with a distinct dark spot at the base of the tail. Body color is more golden-orange than ruby-red. Slightly more elongated body shape.
• Exclamation Point Rasbora (B. Urophthalmoides), Sometimes sold under this common name, same species as the least rasbora. The name comes from the combination of the lateral stripe and tail spot resembling an exclamation mark.

The key to telling B. Maculatus apart from its relatives: look for distinct, rounded dark spots rather than a continuous lateral stripe. If you see a solid dark line running along the body, you’re more likely looking at a chili rasbora or phoenix rasbora.

Male vs. Female

Sexing dwarf rasboras takes patience, but there are some differences in mature fish:

• Males are slightly slimmer and display more intense red coloration, especially when displaying to other males or courting females. Their dark spots also appear more sharply defined.
• Females are slightly rounder and deeper-bodied, particularly when carrying eggs. When viewed from above, gravid females have a noticeably plumper profile compared to the more streamlined males.

These differences are subtle at best and nearly impossible to see in juvenile fish. Having a group of 8 or more adults makes the distinctions easier to spot as the males and females naturally sort themselves out during social interactions.

Average Size & Lifespan

The dwarf rasbora is one of the smallest freshwater fish available in the aquarium hobby. Maximum size is right around 1 inch (2.5 cm) in total length, and most specimens in home aquariums will be closer to 0.6 to 0.8 inches (1.5 to 2 cm). They really are remarkably tiny, if you’ve only kept standard community fish like tetras or barbs, seeing a dwarf rasbora for the first time is of a shock.

Despite their diminutive size, dwarf rasboras have a respectable lifespan of 3 to 5 years with proper care. Stable water conditions, appropriate water chemistry (soft and acidic), a varied diet of small foods, and a stress-free environment are the keys to longevity. Poor water quality and improper parameters will shorten their lifespan significantly, these small-bodied fish have very little margin for error when conditions deteriorate.

Care Guide

Dwarf rasboras are not particularly demanding fish, but they do have some strong preferences that you’ll need to accommodate. The biggest thing to understand is that these are softwater, acidic-water fish to their core. They come from some of the most acidic natural habitats of any commonly kept aquarium fish, and while they don’t need pH 4.0 water in captivity, they absolutely need soft, acidic conditions to thrive and show good color.

Tank Size

A 5-gallon tank is the minimum for a small group of dwarf rasboras, and honestly, a 5-gallon planted nano tank with 8 to 10 of these fish can be one of the most beautiful small aquariums you’ll ever set up. A 10-gallon gives you more room to work with, you can keep a larger group of 12 to 15 and have space for a few tank mates like dwarf shrimp or pygmy corydoras.

These are mid-level swimmers that don’t need a lot of vertical space. Longer, shallower tanks are preferable to tall, narrow ones. A 10-gallon standard or a 5-gallon long-style nano tank works beautifully. Whatever size you choose, stability is the key concern. Smaller tanks experience faster parameter swings, which these tiny fish are sensitive to. If you’re new to nano fishkeeping, starting with a 10-gallon gives you a bit more of a buffer.

Water Parameters

Here’s where the dwarf rasbora gets a little more specialized than your average community fish. These fish genuinely prefer acidic water, not just slightly acidic, but properly acidic. In the wild they live in water with pH values as low as 3.0 to 4.0. In the aquarium, they’ll do well in a pH range of about 5.0 to 6.5, and they can tolerate up to neutral (7.0) without issues. Going above 7.0 is where you’ll start to see problems, faded color, reduced activity, and increased susceptibility to disease.

Water hardness is just as important as pH. These are soft water fish, period. If your tap water is above 5 dGH, you’ll almost certainly need to use RO/DI water remineralized with a product like Seachem Equilibrium, or blend RO water with your tap water until you hit the right range. Running them in hard, alkaline water is a recipe for pale, stressed fish that won’t live anywhere near their potential lifespan.

Indian almond leaves, alder cones, and driftwood all release tannins that naturally lower pH and add the humic substances these fish are adapted to. A blackwater-style setup isn’t just aesthetically appealing for this species, it’s genuinely beneficial for their health and coloration.

Filtration & Water Flow

These fish come from nearly stagnant water, so strong filtration and high flow are not what they want. A sponge filter is the ideal choice for a dwarf rasbora tank. It provides gentle biological filtration, creates minimal water movement, and won’t suck up tiny fish or fry. For slightly larger setups, a small hang-on-back filter with the outflow baffled (a piece of filter sponge over the output works great) is also fine.

Avoid canister filters or powerheads that create strong currents in a nano tank with these fish. They’ll spend all their energy fighting the current instead of displaying their natural, relaxed schooling behavior. If you can see the fish being pushed around by the water flow, it’s too strong.

Lighting

Dwarf rasboras come from dimly lit, heavily shaded blackwater environments, and they look and behave best under moderate to low lighting. Bright lights will make them skittish, washed out, and prone to hiding. If you’re running a planted tank that needs higher light for your plants, add plenty of floating plants, water sprite, frogbit, red root floaters, or salvinia, to create shaded areas. The fish will naturally gravitate toward these darker zones, and their ruby-red color will look far more vivid in softer light.

Plants & Decorations

A well-planted tank is strongly recommended for dwarf rasboras. Dense planting provides security, creates visual barriers that reduce stress, and mimics their natural environment. Great plant choices include:

• Cryptocoryne species, Thrive in soft, acidic water just like these fish. Perfect for mid and foreground planting.
• Java fern and Anubias, Hardy, low-light plants that attach to driftwood and provide broad leaves and hiding spots
• Java moss and other mosses, Excellent for providing cover for fry and creating a natural-looking carpet or covering on hardscape
• Floating plants, Water sprite, frogbit, salvinia, or red root floaters to diffuse lighting and add root structure
• Bucephalandra, Another slow-growing epiphyte that does well in soft water and low to moderate light

Driftwood is almost a must-have. It releases tannins that these fish benefit from and creates a natural-looking blackwater aesthetic. Scatter some dried Indian almond leaves or oak leaves on the substrate for an authentic peat swamp look. The leaves will slowly decompose, release tannins, and harbor microorganisms that the fish will graze on between feedings. Leave an open swimming area in the front or center of the tank so you can actually watch the school move together.

Substrate

A dark substrate is the way to go. Dark sand, fine dark gravel, or an active aqua soil all work well. Active substrates designed for planted tanks are particularly good because many of them buffer the water toward an acidic pH, which is exactly what these fish need. ADA Amazonia and similar products are excellent choices if you’re setting up a dedicated dwarf rasbora nano tank.

Avoid bright white or light-colored substrates. They make the fish feel exposed, wash out their coloration, and don’t reflect the dark, leaf-covered bottoms these fish are accustomed to in the wild.

Tank Mates

Tank mate selection for dwarf rasboras requires some careful thought because of their extremely small size. At under an inch, these fish can fit in the mouth of a surprisingly wide range of other species. You need to think nano-scale when choosing companions, only the smallest, most peaceful fish and invertebrates belong in the same tank.

Best Tank Mates

• Other Boraras species, Chili rasboras, phoenix rasboras, least rasboras. They share identical care requirements and look fantastic together in a mixed Boraras display.
• Pygmy corydoras (Corydoras pygmaeus), Tiny bottom dwellers that stay small enough to be safe companions
• Habrosus corydoras (Corydoras habrosus), Another miniature cory that’s a perfect nano tank mate
• Ember tetras, Small, peaceful, and also do well in soft, acidic water
• Sparkling gouramis, Calm, tiny gouramis that share a preference for blackwater conditions
• Chocolate gouramis, Share the exact same blackwater habitat in the wild (for experienced keepers)
• Dwarf shrimp, Cherry shrimp, crystal red shrimp, and other neocaridina or caridina species. Adult shrimp are safe; baby shrimp will be eaten.
• Small snails, Nerite snails, ramshorn snails, Malaysian trumpet snails
• Otocinclus catfish, Gentle algae eaters, though they prefer slightly different water chemistry

Tank Mates to Avoid

• Any fish large enough to eat them, This rules out most standard community fish. Even a peaceful 2-inch tetra could potentially view a dwarf rasbora as food.
• Bettas, Even in a nano tank, most bettas will harass or eat fish this small
• Dwarf cichlids, Apistogramma and rams are too large and territorial for a nano tank with dwarf rasboras
• Tiger barbs and other nippy species, Way too aggressive and active for these tiny, delicate fish
• Large shrimp species, Amano shrimp are fine, but be cautious with larger species like bamboo shrimp in very small tanks
• Any aggressive or highly active species, Fast-moving fish will outcompete them for food and stress them out

Honestly, a species-only tank with just a group of 10 to 15 dwarf rasboras and some dwarf shrimp is one of the most rewarding nano setups you can build. Don’t feel like you need to fill the tank with other species. Sometimes less is more.

Food & Diet

Dwarf rasboras are omnivorous micropredators with very small mouths. In the wild, they feed on tiny insects, worms, zooplankton, and other microscopic organisms found among leaf litter and decomposing plant matter. In the aquarium, food size is the biggest consideration, these fish physically cannot eat standard-sized flakes or pellets.

A good feeding plan includes:

• Micro pellets or finely crushed flakes, Look for high-quality products specifically designed for nano fish. The food particles need to be small enough for a sub-1-inch mouth.
• Frozen foods, Baby brine shrimp, daphnia, cyclops, and micro bloodworms are all excellent. These small frozen foods are some of the best everyday options for Boraras species.
• Live foods, Baby brine shrimp, microworms, vinegar eels, daphnia, and grindal worms. Live foods bring out the best feeding response and are essential for conditioning breeders.
• Freeze-dried foods, Crushed freeze-dried tubifex or daphnia as an occasional supplement, pre-soaked to prevent digestive issues.

Feed small amounts once or twice daily. These are tiny fish with tiny stomachs, and overfeeding is one of the fastest ways to crash water quality in a nano tank. Offer only what the group can consume in about 60 seconds. If food is hitting the substrate uneaten, you’re feeding too much. In a well-planted tank with leaf litter, the fish will also graze on biofilm and microorganisms between feedings, which helps supplement their diet naturally.

Is the Dwarf Rasbora Right for You?

Before you add a Dwarf Rasbora to your tank, here is an honest assessment of what you’re signing up for. I’d rather you know exactly what to expect now than find out the hard way after you’ve already bought one.

• Experience level: Dwarf Rasboras are best suited for intermediate to advanced keepers. They have specific requirements that can overwhelm beginners.
• Tank size commitment: You’ll need at least 5 gallons, though bigger is always better. Make sure you have room for the tank before buying.
• Tank mate planning: Dwarf Rasboras can be territorial, so plan your community carefully. Not every fish will work as a tank mate.
• Maintenance demands: Expect regular water testing and consistent water changes. Dwarf Rasboras are sensitive to parameter fluctuations.
• Budget reality: Keeping Dwarf Rasboras costs more than typical setups. Budget for ongoing costs, not just the initial purchase.
• Time investment: Beyond daily feeding and weekly maintenance, regular observation is the best way to catch health issues early.
• Long-term commitment: With proper care, Dwarf Rasboras can live up to 5 years. Make sure you’re ready for years of consistent care.

Breeding & Reproduction

Breeding dwarf rasboras is achievable, though it requires some patience and attention to detail. These are egg scatterers that don’t provide any parental care, so the challenge is mainly about creating the right conditions and protecting the eggs and fry from being eaten.

Breeding Difficulty

Moderate. In well-maintained planted nano tanks with soft, acidic water, dwarf rasboras may actually spawn on their own without any intervention. The challenge isn’t triggering spawning, it’s getting the fry to survive. In a community setting, eggs and fry are almost always consumed by other fish (including the parents). Raising fry requires either a dedicated breeding setup or an extremely densely planted tank where some fry can hide.

Spawning Tank Setup

If you want to breed dwarf rasboras intentionally, set up a small breeding tank of 2.5 to 5 gallons with:

• Very dim lighting or a heavily shaded environment
• An air-driven sponge filter on the lowest possible setting
• Clumps of fine-leaved plants like java moss, Taxiphyllum, or spawning mops to catch the scattered eggs
• A bare bottom or a thin layer of dark substrate
• A cover on the tank, keep the environment calm and undisturbed

Water Conditions for Breeding

Soft, acidic water is essential for successful breeding. Target:

• Temperature: 78 to 82°F (26 to 28°C), slightly warmer than normal maintenance temperature
• pH: 5.0 to 6.0
• Hardness: 1 to 3 dGH (very soft)

RO water with minimal remineralization is ideal. Adding Indian almond leaves or peat filtration helps achieve the low pH and provides the tannin-rich water these fish naturally breed in.

Conditioning & Spawning

Condition a small group (ideally 3 to 4 females and 2 to 3 males) with plenty of live and frozen foods for about two weeks prior to breeding attempts. Baby brine shrimp, daphnia, and microworms are excellent conditioning foods. Well-conditioned females will become visibly rounder as they fill with eggs.

Introduce the group to the breeding tank in the evening. Spawning typically occurs in the early morning hours. The male courts the female with subtle displays, and the pair scatters small, adhesive eggs among fine-leaved plants or moss. A single spawning event may produce 30 to 50 eggs, though clutch sizes vary. The eggs are very small and can be difficult to spot.

Egg & Fry Care

Remove the adults after spawning, as they will eat the eggs without hesitation. The eggs hatch in approximately 24 to 48 hours depending on temperature. The fry are absolutely minuscule, among the smallest you’ll encounter in freshwater fishkeeping.

Newly hatched fry will absorb their yolk sac over the first 24 to 48 hours. Once they become free-swimming, they need extremely small first foods. Infusoria (paramecium cultures) or commercially available liquid fry foods are necessary for the first 7 to 10 days. After that, you can transition to freshly hatched baby brine shrimp and microworms. Keep the water extremely clean with very small, careful water changes. Growth is slow, and it takes several weeks for the fry to develop recognizable coloration. Patience is essential.

Common Health Issues

Dwarf rasboras are reasonably hardy when kept in appropriate conditions, but their small body size means they have less reserve to fight off illness. Prevention through proper water quality and stable parameters is far more effective than treatment with this species. Here are the most common issues:

Ich (White Spot Disease)

The most common disease in freshwater aquariums, and dwarf rasboras are susceptible when stressed by temperature fluctuations, poor water quality, or new introductions. Look for small white dots resembling grains of salt on the body and fins. Treat by gradually raising the temperature to 82 to 84°F (28 to 29°C) and using a half dose of ich medication, these small fish can be sensitive to full-strength chemical treatments. Always follow the medication instructions carefully and remove any activated carbon from the filter during treatment.

Fin Rot

Deteriorating, ragged fins indicate a bacterial infection, usually brought on by poor water conditions. In a nano tank, water quality can decline rapidly if maintenance is skipped. Improving water quality through frequent small water changes is often enough to resolve mild cases. Severe fin rot requires an antibacterial treatment.

Bacterial Infections

Columnaris and other bacterial infections can appear as white or grayish patches on the body, mouth, or fins. These are typically triggered by stress from improper water parameters, particularly keeping dwarf rasboras in water that’s too hard or too alkaline. Getting the water chemistry right is the best prevention. Treatment with antibacterial medications may be necessary for active infections, but use reduced doses given the small body size of these fish.

Velvet Disease

Velvet (caused by Piscinoodinium) appears as a fine gold or rust-colored dust on the skin, often visible when you shine a flashlight at an angle across the fish. It’s more common in warm, soft water, exactly the conditions dwarf rasboras prefer. Affected fish may clamp their fins and scratch against surfaces. Treatment typically involves raising the temperature slightly, dimming the lights, and using a copper-based medication at a reduced dose.

The single best preventive measure for all of these issues is maintaining clean, stable water conditions. In nano tanks, that means weekly water changes of 20 to 30%, testing your parameters regularly, not overstocking, and quarantining all new fish before adding them to an established tank.

Common Mistakes to Avoid

• Keeping them in hard, alkaline water. This is the number one mistake. Dwarf rasboras need soft, acidic water to thrive. If your tap water is pH 7.5+ or above 8 dGH, you need to use RO water. Running them in hard water leads to faded color, chronic stress, and shortened lifespans.
• Groups that are too small. A pair or trio of dwarf rasboras will hide, stress, and fade. You need a minimum of 8, and 10 to 15 is better. In a proper-sized school, they’re confident, active, and brilliantly colored. In a group of 3, they’re a ghost of what they should be.
• Feeding food that’s too large. Standard-sized flakes and pellets are literally too big for these fish to eat. You need micro pellets, crushed flakes, or frozen foods sized for nano fish. If the food particles are bigger than their mouths, they’ll go hungry.
• Overstocking a nano tank. Just because they’re small doesn’t mean you can cram 20 of them into a 3-gallon tank. Respect the minimum tank sizes and bioload limits. A 5-gallon is the minimum for 8 to 10 fish.
• Too much light, not enough cover. Bright, unshaded lighting makes these fish pale and skittish. Add floating plants and plant densely to create the shaded, secure environment they need.
• Housing them with inappropriate tank mates. Any fish over about 1.5 inches is potentially a predator of dwarf rasboras. Think nano-scale when choosing companions. A “peaceful” 3-inch fish is still a death sentence for a 0.7-inch rasbora.
• Neglecting water changes in a nano tank. Small tanks accumulate waste quickly. Skipping water changes for even a week or two in a 5-gallon tank can lead to dangerous parameter spikes. Consistency is everything with nano fishkeeping.

Where to Buy

Dwarf rasboras are moderately available in the hobby. You’re unlikely to find them at chain pet stores, but specialty aquarium shops and online retailers frequently carry them, especially shops that cater to the planted tank and nano fish crowd. Prices are typically in the $3 to $5 per fish range, and buying in bulk (10 or more) often gets you a better deal.

For healthy, well-conditioned fish that have been properly quarantined before shipping, I’d recommend checking Flip Aquatics or Dan’s Fish. Both are reputable online retailers that specialize in quality freshwater fish and ship in excellent condition. Buying online is often the best option for nano species like this, since local fish stores may not stock them regularly and you want to get a proper-sized group all at once.

When buying dwarf rasboras, look for fish that are active, alert, and showing decent color. Avoid any that appear lethargic, have clamped fins, or show visible spots or patches. And double-check the species, Boraras species are frequently mislabeled in the trade, so confirm you’re looking at B. Maculatus (dark spots, not a lateral stripe) before you buy.

Frequently Asked Questions

What’s the difference between the dwarf rasbora and the chili rasbora?

Both are Boraras species and share very similar care requirements, but they look quite different once you know what to look for. The dwarf rasbora (B. Maculatus) has distinct, rounded dark spots on a ruby-red body. The chili rasbora (B. Brigittae) has a continuous dark lateral stripe running along its body with a vivid red stripe above it. The chili rasbora is widely recognized as the more intensely colored of the two, with a deeper, more saturated red. Both are excellent nano tank fish, and they can actually be kept together in the same aquarium since they share identical water parameter requirements.

How many dwarf rasboras should I keep?

A minimum of 8, with 10 to 15 being ideal. These are schooling fish that need a group to feel secure and display natural behavior. In a proper-sized school, they’ll stay out in the open, show their best coloration, and exhibit fascinating social interactions between males. In groups of fewer than 6, they’ll hide, stress, and look pale. More is genuinely better with this species.

Can dwarf rasboras live in a 3-gallon tank?

I wouldn’t recommend it. While they’re small enough to physically fit, a 3-gallon tank doesn’t provide enough water volume for stable parameters, and these fish need a group of at least 8 to thrive. A 5-gallon is the true minimum, and a 10-gallon is a much safer and more forgiving starting point. The smaller the tank, the faster water quality deteriorates, and nano fish like dwarf rasboras are sensitive to those swings.

Do dwarf rasboras need a heater?

In most homes, yes. Their preferred temperature range is 73 to 82°F (23 to 28°C). Unless your room temperature consistently stays above 73°F year-round, you’ll need a small heater to keep things stable. In a nano tank, a low-wattage preset heater (25 watts for a 5-gallon, 50 watts for a 10-gallon) is usually sufficient. Temperature stability matters more than hitting an exact number, avoid swings of more than 2 to 3 degrees in a day.

Are dwarf rasboras good with shrimp?

Adult cherry shrimp, crystal red shrimp, and other dwarf shrimp are safe with dwarf rasboras. However, shrimplets (baby shrimp) may be eaten since they’re small enough to fit in the rasboras’ mouths. If you’re actively breeding shrimp, provide plenty of dense moss and plant cover for the babies to hide in. This isn’t a species that hunts shrimp, but opportunistic snacking on newborn shrimplets is always a possibility with any fish, no matter how small.

Why are my dwarf rasboras pale?

Pale coloration in dwarf rasboras is almost always caused by one or more of these factors: water that’s too hard or alkaline (check your pH and GH first), too-bright lighting without enough shade, a group that’s too small, stress from aggressive or overly active tank mates, or a bland diet lacking frozen and live foods. Getting the water soft and acidic, adding floating plants for shade, keeping a group of 8 or more, and feeding a varied diet with frozen baby brine shrimp and daphnia will usually resolve the issue within a couple of weeks.

How the Dwarf Rasbora Compares to Similar Species

If you’re considering a Dwarf Rasbora, you’ve probably also looked at the Chili Rasbora. Both fill similar roles, but the differences matter when planning your tank. The Dwarf Rasbora has its own distinct personality and care needs. In my experience, the choice often comes down to the specific community you’re building and whether your water parameters favor one over the other.

The Strawberry Rasbora is worth considering as well. While the Dwarf Rasbora and the Strawberry Rasbora share some overlap in care, they bring different energy to a tank. If you have the space, keeping both in separate setups gives you a great chance to compare their behavior firsthand.

Closing Thoughts

The dwarf rasbora is one of those fish that really shows you what nano fishkeeping is all about. In a properly set up blackwater nano tank, soft acidic water, dense planting, tannin-stained water, dim lighting, a school of these tiny ruby-red fish is genuinely breathtaking. They’re living proof that you don’t need a massive aquarium or big, flashy fish to create something beautiful.

As the type species for the Boraras genus, B. Maculatus has a special place in the nano fishkeeping world. It’s the fish that started it all for this group of miniature rasboras that have become some of the most sought-after species among planted tank enthusiasts. Keep them in a proper school, give them the soft, acidic water they crave, feed small foods regularly, and they’ll reward you with years of subtle, jewel-like beauty. If you’re looking to set up a nano tank that packs real visual impact into a small footprint, the dwarf rasbora belongs at the top of your list.

This guide is part of our Rasboras & Danios: Complete Species Directory. Visit the hub page to explore care guides for all popular rasbora and danio species.

Recommended Video

Check out our rasbora video for more on these amazing nano fish, including the dwarf rasbora:

References

• Boraras maculatus (Duncker, 1904), FishBase
• Boraras maculatus Profile, Seriously Fish
• Dwarf Rasbora Care Guide, Practical Fishkeeping
• Kottelat, M. (1993). “Diagnoses of two new genera and three new species of small fishes from Thailand.”, Ichthyological Exploration of Freshwaters, 4(4): 313-320.

Table of Contents

• What Care Guides Get Wrong
• Key Takeaways
• Species Overview
• Classification
• Origin & Natural Habitat
• Appearance & Identification
• Average Size & Lifespan
• Care Guide
• Is It Right for You?
• Tank Mates
• Food & Diet
• Breeding & Reproduction
• Common Health Issues
• Common Mistakes to Avoid
• Where to Buy
• Frequently Asked Questions
• Species Comparison
• Closing Thoughts
• Recommended Video
• References

The glowlight danio has a bright, luminous stripe that rivals the glowlight tetra for visual impact, but it comes with all the hardiness and activity that danios are known for. It stays small at about an inch and a half, schools beautifully, and tolerates a wider range of conditions than most nano species. It is one of the best nano danios available, and hardly anyone stocks it.

In a group of eight or more with a dark background, the glowing stripe catches light in a way that makes the fish look almost bioluminescent. This guide covers the care it needs, because the glowlight danio is the fish that makes people ask what it is. The answer should be: one of the best-kept secrets in the nano hobby.

If you want a nano schooler that is hardy, beautiful, and different from what everyone else keeps, the glowlight danio is it.

Key Takeaways

• One of the most colorful small danios available, vibrant orange-gold vertical bars with turquoise-blue accents make this a standout nano fish
• Shares a genus with the Celestial Pearl Danio, both are Celestichthys species, though the glowlight danio was previously classified under Danio
• Hill stream species from northern Myanmar that prefers cooler water (68-79°F) and moderate flow
• Peaceful and perfect for nano communities, best kept in groups of 8 or more in a minimum 10-gallon tank
• Easy to moderate care level, hardy once established, but they need clean water and a varied diet to show their best colors
• Egg scatterer that can be bred in captivity, though raising the tiny fry requires small live foods like infusoria

Species Overview

Classification

The glowlight danio was first described by Sunder Lal Hora in 1928 as Danio choprae, named after B.N. Chopra, a fellow zoologist. For decades, that’s where it sat taxonomically, just another small Danio species. But molecular research in the 2000s shook up the danio family tree considerably, and this species got caught up in the reclassification.

The key change came when researchers recognized that a small group of tiny, highly colorful species from Myanmar formed a distinct clade within the broader danio lineage. These species were split into the genus Celestichthys, a name that translates to “heavenly fish.” The genus currently includes just three species: the glowlight danio (C. Choprae), the Celestial Pearl Danio (C. Margaritatus), and the emerald dwarf rasbora (C. Erythromicron). All three are small, strikingly colorful, and native to Myanmar.

You’ll still see this fish listed as Danio choprae in many hobbyist references, older care guides, and even some retailer listings. Both names refer to the same fish, but Celestichthys choprae is the currently accepted scientific name. The practical takeaway for fishkeepers: this fish is more closely related to the Celestial Pearl Danio than it is to zebra danios, and understanding that relationship helps make sense of its care preferences.

Origin & Natural Habitat

The glowlight danio is native to northern Myanmar, specifically the hill streams and tributaries in the regions around the Irrawaddy River drainage. These are not lowland tropical rivers. The fish inhabits clear, moderately flowing streams at higher elevations, typically in areas with rocky or gravelly substrates, overhanging vegetation, and relatively cool water compared to lowland Southeast Asian habitats.

The streams these fish call home are well-oxygenated with some current, shaded by riparian vegetation, and characterized by slightly acidic to neutral water chemistry. The substrates are typically a mix of gravel, cobbles, and sand, with submerged leaf litter and fallen branches providing cover and foraging opportunities. The water in these hill streams is soft to moderately hard, with temperatures that can drop into the upper 60s°F (around 20°C) during cooler seasons.

This habitat context is important for understanding why glowlight danios do well in planted tanks with some flow, why they tolerate a broader temperature range than many tropical nano fish, and why they appreciate slightly acidic to neutral water rather than the alkaline conditions preferred by their Inle Lake cousins (the emerald dwarf rasbora). The northern Myanmar hill streams where glowlight danios live are a different environment from Inle Lake, and the care requirements reflect that difference.

Wild populations are not considered threatened at this time, though habitat degradation from deforestation and agricultural runoff is an ongoing concern across many freshwater systems in Myanmar. Most glowlight danios available in the hobby are captive-bred, which is good news for both conservation and for hobbyists, tank-bred fish are hardier and adapt more readily to aquarium conditions.

Appearance & Identification

This is the section where the glowlight danio really earns its reputation. The body shape is typical danio, elongated, slightly compressed, with a small terminal mouth suited for mid-water and surface feeding. But the coloration is where this fish sets itself apart from just about every other small danio in the hobby.

The base body color is a deep blue-green to turquoise, overlaid with a series of bright orange to golden-yellow vertical bars that run along the flanks. These bars are vivid and well-defined, giving the fish an almost banded appearance that catches the light beautifully. Between the bars, the blue-green iridescence creates a striking contrast that’s hard to capture in photos but genuinely impressive in person. The fins show orange to reddish-orange tones, particularly the anal and caudal fins, which adds even more warmth to the overall color palette.

The effect is a fish that seems to glow from within, hence the common name. Under good aquarium lighting, especially against a dark substrate and background, a school of glowlight danios is genuinely one of the most visually impressive displays you can create in a nano tank. The warm orange and gold tones are unusual in the danio world, where blues, silvers, and greens will dominate, and that’s a big part of what makes this species stand out.

If you’re familiar with the Celestial Pearl Danio, you can see the family resemblance in the body shape and the general approach of “dark body with bright markings plus colorful fins.” But where CPDs have pearl-like spots on a dark blue body, glowlight danios have orange bars on a turquoise body. They’re like two variations on the same theme, and they look fantastic together in a tank.

Male vs. Female

Sexing glowlight danios is fairly straightforward once the fish are mature and well-conditioned. Males are slimmer, more intensely colored, and will have bolder, more saturated orange bars. When males are competing with each other or courting females, their colors can become remarkably vivid, the orange practically glows. Males are also slightly smaller than females on average.

Females are rounder and deeper-bodied, especially when carrying eggs. Their coloring is still attractive but generally more subdued compared to a displaying male, the bars are present but less crisp, and the overall contrast between the orange and blue tones is softer. The most reliable way to tell them apart is body shape: viewed from above or the side, a mature female will have a noticeably fuller belly compared to the lean, streamlined profile of a male.

Average Size & Lifespan

Glowlight danios are small fish. Adults top out at about 1.2 inches (3 cm), with most individuals staying right around the 1-inch mark in aquarium conditions. They’re in the same size class as Celestial Pearl Danios and emerald dwarf rasboras, which makes sense given that they’re all in the same genus. Fish purchased from stores are often juveniles at around 0.5 to 0.75 inches (1.3 to 2 cm) and will reach full size within a few months under good care.

With proper husbandry, glowlight danios typically live 3 to 5 years. That’s a solid lifespan for a fish this size and is achievable as long as water quality is maintained, the fish are fed a varied diet, and stress is kept to a minimum. Fish kept at the cooler end of their temperature range will have slightly slower metabolisms and may live toward the longer end of that range, while consistently warmer temperatures can shorten lifespan somewhat.

Care Guide

Tank Size

A 10-gallon (38-liter) tank is the minimum for a group of glowlight danios. These fish need to be kept in groups of at least 6 to 8 (more is better), and while they’re tiny, they’re active little swimmers that appreciate room to move around. A 10-gallon gives you space for a proper school plus some plants and hardscape without cramping anyone.

If you want to build a nano community with glowlight danios alongside other small species, stepping up to a 15 or 20-gallon long is a smart move. The extra footprint gives you more flexibility for tank mates, more room for aquascaping, and a larger water volume that’s easier to keep stable. A 20-gallon long with a school of 10-12 glowlight danios and a densely planted layout is honestly one of the most visually rewarding small tank setups you can put together.

Water Parameters

Glowlight danios are reasonably adaptable within their preferred range, but the sweet spot for most hobbyists is going to be somewhere in the low-to-mid 70s°F, with a slightly acidic to neutral pH. If your tap water is in the 6.5 to 7.0 pH range with moderate hardness, you’re in excellent shape for this species without needing to make any adjustments.

One thing worth noting: unlike their close relative the emerald dwarf rasbora (which prefers harder, more alkaline water from Inle Lake), glowlight danios come from soft to moderately hard hill streams and do fine in softer water. They also tolerate a wider temperature range than many nano fish, handling everything from the upper 60s to the upper 70s°F. This flexibility makes them a good fit for a wider variety of community setups compared to the more demanding emerald dwarf rasbora.

As always, stability matters more than hitting a specific number. Avoid sudden swings in temperature or pH, and keep up with regular water changes to prevent nitrate buildup. Weekly 20-25% water changes are a good baseline for keeping things clean and consistent.

Filtration & Water Flow

Glowlight danios come from flowing hill streams, so they appreciate some water movement, more so than their still-water relatives from Inle Lake. A hang-on-back filter or small canister filter that provides gentle to moderate flow works well. They’ll often swim into the current, which is natural behavior for a stream-dwelling species. You don’t need a powerhead or strong current, but a bit of flow keeps them active and comfortable.

A sponge filter is another solid option, especially in smaller tanks. It provides reliable biological filtration without creating turbulence that could push these small fish around. For a 10-gallon nano tank, a well-sized sponge filter is really all you need. If you’re using a hang-on-back filter, make sure the intake is covered with a sponge pre-filter to prevent tiny fish or fry from being sucked in.

Lighting

Moderate lighting is the sweet spot for glowlight danios. You want enough to support plant growth (and these fish look their best in a planted tank), but not so much that the environment feels harsh and exposed. In their native streams, overhanging vegetation provides dappled shade, and recreating that effect in the aquarium helps the fish feel secure and brings out their colors.

A standard planted tank LED on a timer running 8-10 hours per day works well. Floating plants are a great way to soften the light and create that shaded canopy effect. Under the right lighting, especially with a dark substrate and background, the orange bars on glowlight danios practically glow. It’s worth taking the time to dial in your lighting setup, because it makes a real difference in how these fish present.

Plants & Decorations

A planted tank is the natural choice for glowlight danios, and the fish will reward you with better color and more confident behavior when they have plenty of vegetation to feel secure in. Aim for a good balance, dense planting along the sides and back, with open swimming space through the middle and front of the tank. These fish like to cruise through and around plant thickets, darting in and out of cover.

Good plant choices include java fern, java moss, Cryptocoryne species, Rotala, Hygrophila, and various stem plants that create vertical structure. Floating plants like Amazon frogbit, red root floaters, or salvinia provide overhead shade that these fish appreciate. Moss-covered driftwood and small stones add natural-looking cover and give the tank a hill-stream feel that suits the species well.

Since glowlight danios prefer slightly acidic to neutral water, driftwood and botanical elements that release tannins and slightly lower pH are perfectly compatible with their care. This is a notable difference from the emerald dwarf rasbora, which comes from alkaline water and doesn’t do as well with tannin-heavy setups.

Substrate

Fine gravel or sand works well. If you’re running a planted tank (and you should be with these fish), a nutrient-rich aquasoil or a sand substrate with root tabs will support healthy plant growth. Darker substrates, black sand, dark gravel, or dark aquasoil, will make the orange and turquoise colors on your glowlight danios pop dramatically. The contrast between a dark background and those vivid orange bars is genuinely striking.

Since glowlight danios tolerate slightly acidic water, buffering aquasoils that will lower pH slightly aren’t a concern for this species the way they would be for alkaline-loving fish. That makes them a great match for the typical planted tank setup that many hobbyists are already running.

Is the Glowlight Danio Right for You?

Before you buy, run through this honest checklist. The Glowlight Danio is a great fish for the right keeper, but it is not for everyone.

• You want a naturally beautiful danio that glows without genetic modification
• You have a 15-gallon or larger tank with a dark substrate and warm-toned lighting
• You can keep a group of 8+ for active schooling behavior
• You want a hardy, easy-to-keep species that tolerates a wide range of conditions
• Your tank has other peaceful, active community fish
• You appreciate natural iridescence over artificial fluorescence

Tank Mates

Glowlight danios are peaceful community fish that work well with a variety of similarly sized, non-aggressive species. Their small size and calm temperament make them ideal candidates for a nano community, but you’ll want to choose tank mates that won’t outcompete them for food or intimidate them into hiding.

Best Tank Mates

• Celestial Pearl Danios, Same genus, similar size, overlapping water parameters. One of the best pairings you can make, and the contrasting color patterns (spots vs. Bars) look fantastic together
• Emerald Dwarf Rasboras, Another Celestichthys species. Compatible in temperament and size, though watch the pH overlap since emerald dwarfs prefer slightly more alkaline water
• Small Corydoras species, Pygmy corys (C. Pygmaeus), dwarf corys (C. Habrosus), and hastatus corys are peaceful bottom-dwellers that occupy a different zone
• Otocinclus catfish, Gentle algae grazers that ignore other fish
• Chili rasboras and other micro rasboras, Tiny, peaceful, and share similar water preferences
• Ember tetras, Small, peaceful, and the warm orange coloring complements glowlight danios nicely
• Cherry shrimp and Amano shrimp, Safe and beneficial tank mates that add color and cleanup
• Nerite snails, Great algae control with zero impact on the fish

Tank Mates to Avoid

• Bettas, Too territorial for a small nano setup, and the colorful pattern of glowlight danios can trigger aggression
• Larger barbs (tiger barbs, etc.), Too boisterous, too food-competitive, and likely to harass smaller fish
• Dwarf cichlids (rams, apistos), Too territorial and larger than ideal for pairing with fish this small
• Any fish over 2-3 inches, Larger fish create stress just by being present, and anything that can fit a glowlight danio in its mouth probably will
• Aggressive or highly active mid-dwelling species, Fish that zip around the tank at high speed will stress out these relatively calm small danios

A species-only setup or a carefully chosen nano community is where glowlight danios really shine. In a planted 10 or 15-gallon with a school of 8-10 glowlight danios, maybe a few pygmy corys on the bottom, and some cherry shrimp, you’ll get the best color, the most natural behavior, and a tank that’s genuinely beautiful to watch.

Food & Diet

Glowlight danios are omnivores that will accept a wider range of foods than some of their pickier genus-mates. They’ll eat high-quality micro pellets, crushed flakes, and frozen and live foods without much fuss. That said, a varied diet is key to getting the best coloration and long-term health out of these fish. A fish fed nothing but flakes will survive but won’t look anything like a fish getting regular variety in its meals.

Good diet staples and supplements include:

• High-quality micro pellets or crushed flakes, A good daily staple. Choose a brand with whole-food ingredients rather than fillers
• Baby brine shrimp (live or frozen), Excellent for color enhancement and one of the best all-around foods for small fish
• Daphnia, Great supplemental food, readily accepted, and helps with digestion
• Frozen cyclops, Perfect size for small mouths and widely available
• Micro worms and grindal worms, Easy to culture at home and a great protein-rich treat
• Frozen or live bloodworms, Chopped small, these make an occasional high-protein treat (don’t overfeed bloodworms)

Feed small amounts once or twice daily, only as much as the fish can consume in about two minutes. These fish have small stomachs and do better with frequent, modest meals than one large feeding. In a community tank, watch to make sure glowlight danios are actually getting their share of the food. They’re not the most aggressive feeders, and larger or faster tank mates will push them aside.

Breeding & Reproduction

Glowlight danios can be bred in home aquariums, and while it requires a bit more effort than breeding zebra danios, it’s well within reach for hobbyists willing to set up a dedicated breeding tank and provide the right conditions.

Breeding Difficulty

Moderate. Getting adults to spawn isn’t the hardest part, raising the extremely small fry through the first couple of weeks is where the real challenge lies. You’ll need a supply of infusoria or similarly tiny first foods to get them through the critical early stage before they’re large enough for baby brine shrimp.

Spawning Tank Setup

Set up a separate 5 to 10-gallon tank specifically for breeding. Line the bottom with a layer of glass marbles or a mesh grid to protect eggs from being eaten by the adults. Java moss is the ideal spawning medium, drape clumps of it across the tank to give the fish surfaces to scatter eggs into. The fine texture of java moss catches and holds the tiny eggs, keeping them somewhat hidden from hungry parents.

Use a gentle sponge filter to maintain water quality and aeration without creating strong current or sucking in fry. Keep the lighting dim and provide a few plant clumps for cover so the breeding group feels comfortable.

Water Conditions for Breeding

Match the breeding tank water to the main tank parameters, temperature around 72-76°F (22-24°C), pH 6.5-7.0, and soft to moderately soft water. A slight temperature drop of a degree or two followed by a gradual warm-up, combined with generous live food feedings, can help trigger spawning behavior. Some breeders report that a partial water change with slightly cooler, soft water mimics the rainy-season conditions that stimulate spawning in the wild.

Conditioning & Spawning

Condition a group of adults (aim for 2-3 males per female) with a rich diet of live baby brine shrimp, daphnia, and other small live foods for 1-2 weeks before moving them to the breeding tank. Well-conditioned females will become noticeably plumper as they fill with eggs.

Introduce the conditioned group to the breeding tank in the evening. Spawning typically occurs the following morning, often stimulated by the first light of the day. Males will display their most vivid coloring and court the females, driving them into the plant cover where eggs are scattered among the moss and across the substrate. Glowlight danios scatter adhesive eggs in small batches rather than producing one large clutch. Remove the adults promptly after spawning, because they will eat any eggs they find.

Egg & Fry Care

Eggs typically hatch in 2-4 days depending on water temperature. The newly hatched fry are extremely small and will absorb their yolk sacs over the first 24-48 hours before becoming free-swimming. This is the make-or-break stage.

Free-swimming fry are too tiny for baby brine shrimp at first. Start them on infusoria, paramecium, commercially prepared liquid fry food, or vinegar eels for the first 10-14 days. Once they’ve grown enough to take newly hatched brine shrimp (usually around two weeks old), growth accelerates noticeably. Keep the water pristine with small, frequent water changes (10-15% every other day), temperature-matched to the tank. Fry growth is slow, and it will take 2-3 months before the young fish start developing the distinctive orange barring of the adults.

Common Health Issues

Glowlight danios are hardy fish without any species-specific diseases. Like all freshwater fish, they’re susceptible to common ailments when water quality slips or stress levels climb. Here are the main issues to watch for.

Ich (White Spot Disease)

The most common freshwater fish disease, and glowlight danios aren’t immune. White spots on the body and fins, flashing against objects, and clamped fins are the telltale signs. Since glowlight danios tolerate warmer water better than some of their cooler-water relatives, you can use the standard approach of gradually raising the temperature to around 82-84°F (28-29°C) alongside an appropriate ich medication. Catch it early and it’s very treatable.

Fin Rot

Usually caused by poor water quality or stress, fin rot shows up as fraying, ragged, or disintegrating fin edges, sometimes with redness at the base. The first step is always to check and improve water quality, do a water change, test your ammonia, nitrite, and nitrate levels, and figure out what went wrong. Mild cases often resolve with clean water alone. More advanced cases need a broad-spectrum antibacterial treatment.

Velvet Disease

Caused by the parasite Oodinium, velvet appears as a fine, dusty gold or rust-colored sheen on the body. It can be easy to miss in the early stages, especially on a fish with warm coloring like the glowlight danio. If you notice your fish clamping their fins, losing appetite, or rubbing against surfaces, look closely under a flashlight for that characteristic dusty coating. Treat the entire tank with a copper-based medication and dim the lights during treatment, since the parasite has a photosynthetic stage.

Stress-Related Issues

Chronic stress is probably the most common underlying cause of health problems in glowlight danios. Fish kept in groups that are too small, in tanks with no plant cover, with aggressive or overly active tank mates, or in fluctuating water conditions will show persistent pale coloring, clamped fins, loss of appetite, and increased vulnerability to infections. The solution isn’t medication, it’s correcting the environment. Make sure the group is large enough (8+), the tank is well-planted, and the water parameters are stable.

Common Mistakes to Avoid

• Keeping too few. Glowlight danios are shoaling fish that need the security of numbers. A group of 3-4 will be stressed, pale, and constantly hiding. Keep at least 6-8, and ideally 10 or more. You’ll see dramatically better color and behavior in a proper-sized group.
• Not enough plant cover. A bare tank or sparsely planted setup will produce timid, washed-out fish. These fish come from streams with overhanging vegetation, and they need plants to feel secure. Dense planting is the single biggest factor in getting confident, colorful glowlight danios.
• Feeding only dry food. While glowlight danios will accept flakes and pellets (unlike the pickier emerald dwarf rasbora), a diet of nothing but dry food won’t bring out their best coloring. Mix in frozen or live baby brine shrimp, daphnia, or cyclops at least a few times per week for a noticeable difference in vibrancy.
• Mixing with incompatible tank mates. Putting these 1-inch fish in a community tank with larger, more aggressive, or highly active species is a recipe for stressed, hiding, non-eating fish. Choose tank mates carefully and keep the peace in your nano community.
• Skipping the lid. Like all danios, glowlight danios can and will jump, especially when startled, during feeding, or when males are chasing. Use a tight-fitting lid with no gaps. This is non-negotiable.
• Ignoring water quality in small tanks. A 10-gallon nano tank has less water volume to buffer against waste buildup. Stay on top of weekly water changes and test your parameters regularly. Small tanks go sideways faster than large ones when maintenance slips.
• Confusing them with other danio species. Some retailers mislabel glowlight danios or mix them in with other small danio species. Know what you’re looking for, the distinctive orange bars on a turquoise body are the key identifier. If the fish look plain or washed out at the store, they may be stressed or mislabeled.

Where to Buy

Glowlight danios are less commonly stocked than zebra danios or even Celestial Pearl Danios, but they’re becoming easier to find as more hobbyists discover them. Your local fish store may carry them occasionally, but don’t count on consistent availability at chain pet stores. Specialty aquarium shops with a focus on nano fish are your best bet for finding them locally.

For a more reliable source, I’d recommend checking Flip Aquatics or Dan’s Fish. Both are reputable online retailers that specialize in quality freshwater fish and ship in excellent condition. Online retailers will carry a wider selection of specialty nano species like the glowlight danio compared to most brick-and-mortar stores. When ordering, try to buy a group of at least 8-10 at once, they ship and acclimate better in larger numbers.

Frequently Asked Questions

Are glowlight danios the same as Celestial Pearl Danios?

No, but they’re closely related. Both are in the genus Celestichthys, which currently contains just three species. The Celestial Pearl Danio (C. Margaritatus) has a dark blue body covered in pearl-like spots, while the glowlight danio (C. Choprae) has orange-gold bars on a turquoise body. They’re distinct species with different appearances, though their care requirements overlap significantly. They can be kept together and actually make a beautiful pairing in a nano tank.

How many glowlight danios should I keep?

A minimum of 6, but 8-10 or more is strongly recommended. Glowlight danios are shoaling fish that feel more secure, show better color, and display more natural behavior in larger groups. In small numbers (3-4 or fewer), they’ll be stressed, pale, and perpetually hiding. A bigger group is always better with this species.

Do glowlight danios need a heater?

It depends on your room temperature. These fish tolerate a range of 68-79°F (20-26°C), which means they can go without a heater in many homes during warmer months. However, if your room temperature drops below 68°F consistently, for example, in an unheated room during winter, a low-wattage heater set to around 72-74°F is a good idea. They’re more temperature-flexible than some of their Celestichthys relatives, which makes them a bit more forgiving on this front.

Can glowlight danios live with shrimp?

Yes. Adult cherry shrimp and Amano shrimp are safe with glowlight danios. The fish are too small to bother adult shrimp. However, very tiny shrimp fry (newborn cherry shrimp, for example) may get eaten if the danios come across them. In a well-planted tank with plenty of moss and hiding spots, enough shrimp fry will survive to maintain a breeding colony. Glowlight danios and cherry shrimp actually complement each other well in a nano setup.

Why did the scientific name change from Danio choprae to Celestichthys choprae?

Molecular research showed that the glowlight danio, along with the Celestial Pearl Danio and emerald dwarf rasbora, forms a distinct evolutionary group within the broader danio lineage. Researchers split these species into their own genus, Celestichthys (meaning “heavenly fish”), to reflect this relationship. The old name Danio choprae is still widely used in hobbyist circles and by some retailers, but Celestichthys choprae is the currently accepted scientific name. Both refer to the same fish.

Are glowlight danios jumpers?

Yes. All danios have a tendency to jump, and glowlight danios are no exception. They’re most likely to jump when startled, during feeding frenzies, or when males are chasing each other. A tight-fitting lid is essential, open-top aquariums are not suitable for this species. Even small gaps around filter intakes or heater cords can be enough for a determined danio to squeeze through, so cover your tank thoroughly.

How the Glowlight Danio Compares to Similar Species

Glowlight Danio vs. Pearl Danio

Both are beautiful danios with iridescent qualities. The Pearl Danio has a more pearlescent, mother-of-pearl sheen, while the Glowlight Danio has warmer gold tones. Both are hardy and easy to keep. The Pearl Danio is slightly larger and more commonly available.

Glowlight Danio vs. Zebra Danio

The Zebra Danio is hardier and more widely available, but the Glowlight Danio is more visually interesting with its warm iridescence. For beginners, the Zebra Danio is the easier starting point. For something more special, the Glowlight Danio is the upgrade.

Closing Thoughts

The glowlight danio is one of the hobby’s hidden gems, a fish that combines stunning color, peaceful temperament, manageable size, and reasonable hardiness into a package that works beautifully in a planted nano tank. The orange-gold bars against that turquoise body are genuinely hard to beat at this size, and a school of these fish in a well-lit, dark-substrate planted tank is the kind of setup that makes people want to get into the hobby.

It’s also a fish that benefits from the growing understanding of the Celestichthys genus. Knowing that the glowlight danio is a close relative of the Celestial Pearl Danio opens up some fantastic stocking ideas, a planted nano tank with both species showcasing their different color patterns is one of the most visually impressive small setups you can build. If you’ve been sleeping on this species while everyone else talks about CPDs, it is time to give the glowlight danio its moment in the spotlight.

Have you kept glowlight danios? How do they compare to other small danios in your experience? Drop a comment below!

This guide is part of our Rasboras & Danios: Complete Species Directory. Visit the hub page to explore care guides for all popular rasbora and danio species.

Recommended Video

Check out our danio species video for an overview of some of the best danios in the hobby, including the glowlight danio:

References

• Celestichthys choprae (Hora, 1928), FishBase
• Celestichthys choprae Profile, Seriously Fish
• Glowlight Danio Species Profile, Practical Fishkeeping
• Danio choprae, The Aquarium Wiki

Table of Contents

• What Care Guides Get Wrong
• Key Takeaways
• Species Overview
• Classification
• Origin & Natural Habitat
• Appearance & Identification
• Average Size & Lifespan
• Care Guide
• Is It Right for You?
• Tank Mates
• Food & Diet
• Breeding & Reproduction
• Common Health Issues
• Common Mistakes to Avoid
• Where to Buy
• Frequently Asked Questions
• Species Comparison
• Closing Thoughts
• Recommended Video
• References

The gold ring danio is a small, rarely seen species that stays under an inch and a half. It has delicate golden ring-shaped markings that give it its name, and it needs the kind of stable, mature conditions that most beginners cannot provide. It is not a starter fish. It is a specialist nano species for keepers who want something uncommon.

In a properly set up nano tank with a group of at least eight, gold ring danios are active, subtly beautiful, and genuinely engaging. This guide covers what they need, because the gold ring danio is the danio you keep when you have outgrown the common species and want something with more nuance.

If you are still keeping zebra danios, the gold ring danio is the next step. It is smaller, rarer, and more rewarding.

Key Takeaways

• Distinctive spotted pattern, unlike most danios, the gold ring danio has dark spots ringed in gold rather than stripes, giving it a unique leopard-like appearance
• True nano fish that maxes out at about 1 inch (2.5 cm), making it an excellent choice for smaller aquariums starting at 10 gallons
• Keep in groups of 8 or more for the best behavior and coloration. Males spar and display constantly in groups, it’s harmless but genuinely entertaining to watch
• Peaceful community fish that pairs well with other small, non-aggressive species like celestial pearl danios, ember tetras, and small rasboras
• Easy to breed as an egg scatterer, though raising the tiny fry requires some preparation and the right first foods
• Relatively recent discovery, described in 2003 from northern Myanmar, the same region where celestial pearl danios were later found

Species Overview

Classification

The gold ring danio was described in 2003 by Sven O. Kullander and Fang Fang from specimens collected in northern Myanmar. This makes it one of the more recently described danio species, entering the scientific literature decades after familiar relatives like the zebra danio and pearl danio. The species is named after Tin Win, a collector who contributed significantly to the discovery of new fish species from Myanmar.

Like all danios, D. Tinwini was historically lumped into the massive family Cyprinidae before molecular studies separated the danios into their own family, Danionidae. Within the genus Danio, the gold ring danio belongs to the Danio rerio species group, making it a close relative of the zebra danio despite looking nothing like one. The spotted pattern is a notable departure from the striped body plan that defines most members of this group.

Origin & Natural Habitat

Gold ring danios come from a small region in northern Myanmar, specifically from streams and tributaries in the area around the town of Mogok in the Shan Plateau region. This is the same general area that produced the celestial pearl danio (Danio margaritatus), and the two species share similar habitat preferences. If you’re familiar with keeping CPDs, you already have a head start on understanding what gold ring danios need.

In the wild, these fish inhabit clear, shallow streams with moderate flow, often in hilly or mountainous terrain at moderate elevations. The substrate in these streams is typically a mix of sand, gravel, and small rocks, with submerged vegetation and leaf litter along the margins. The water is well-oxygenated, slightly acidic to neutral, and relatively soft, typical of forest streams fed by rainfall rather than limestone-rich spring water.

The seasonal climate in northern Myanmar means these streams experience some temperature variation throughout the year, with water temperatures ranging from the upper 60s°F in cooler months to the upper 70s°F during the warmest periods. This gives the gold ring danio a comfortable temperature range that works well in most home aquariums without needing to push the heater to extremes in either direction.

Appearance & Identification

The gold ring danio has one of the most distinctive patterns in the entire danio family. Instead of the horizontal stripes that characterize most Danio species, D. Tinwini sports a pattern of dark spots scattered across a golden-tan body. Each dark spot is surrounded by a ring of bright gold or golden-yellow, giving the fish its common name. The overall effect looks remarkably like a miniature leopard or jaguar, and it’s immediately recognizable once you’ve seen it.

The base body color ranges from pale gold to warm tan, with the spotted pattern extending from behind the gill cover all the way back to the caudal peduncle. The spots also continue onto the dorsal, anal, and caudal fins, which adds to the busy, intricate look. A faint dark lateral stripe may be visible running through the middle of the body, connecting some of the spots in a broken line. The belly is lighter, often silvery-white.

The body shape is classic danio, elongated, slightly laterally compressed, with a small upturned mouth designed for feeding at the surface and mid-water. At a maximum size of about 1 inch (2.5 cm), this is a genuinely small fish. You won’t appreciate the full beauty of the pattern from across the room, you need to get close to really see those golden rings in detail. That’s part of the charm of keeping nano fish.

Male vs. Female

Sexing gold ring danios is tricky until the fish are fully mature, but there are reliable differences once you know what to look for. Males are slightly slimmer and more intensely colored, with bolder spotting and brighter gold rings. They’re also the ones you’ll see chasing each other and sparring, males display and joust constantly in groups, flaring their fins and circling each other in brief but spirited bouts. It’s completely harmless behavior and honestly one of the best things about keeping this species.

Females are a bit deeper-bodied, especially when carrying eggs. A gravid female will look noticeably rounder when viewed from above compared to the sleeker males. The coloration on females is slightly more muted, but still attractive. In a well-balanced group with both sexes, you’ll almost always see males putting on displays for the females, which makes for a very active and engaging aquarium.

Average Size & Lifespan

Gold ring danios are true nano fish, maxing out at about 1 inch (2.5 cm) in length. Most specimens available in the hobby are sold as juveniles at around 0.5 to 0.75 inches (1.3 to 2 cm) and will reach full adult size within a few months under good conditions. Their small size is part of what makes them so well-suited for nano tanks and smaller community setups where larger danios would feel cramped.

With proper care, gold ring danios typically live 3 to 5 years. That’s a solid lifespan for a fish this small. As with most nano species, the keys to longevity are stable water conditions, a varied diet, low stress, and avoiding overcrowding. Fish kept in well-maintained, appropriately sized groups will live longer and show better coloration throughout their lives compared to stressed individuals in poor conditions.

Care Guide

Tank Size

A 10-gallon (38-liter) tank is the minimum for a group of gold ring danios. At just 1 inch (2.5 cm) fully grown, they don’t need a massive aquarium, but they do need enough space to swim, school, and, most importantly, spar and display without running into each other constantly. A 10-gallon tank comfortably houses a group of 8 to 10 gold ring danios, which is really the minimum number you should keep to see their best behavior.

If you’re planning a nano community with other small species, bumping up to a 15 or 20-gallon tank gives everyone more room and makes the tank easier to maintain. Larger tanks also provide more stable water parameters, which matters with nano species that produce a light bioload. A 20-gallon long with a school of gold ring danios, some celestial pearl danios, and a few shrimp is about as perfect as a nano community gets.

Water Parameters

Gold ring danios are fairly flexible when it comes to water parameters, but they do best in slightly acidic to neutral water on the softer side. Their native streams in Myanmar are soft and mildly acidic, so a pH around 6.5 to 7.0 and hardness between 2 and 10 dGH hits the sweet spot. That said, they’re adaptable enough to thrive in most tap water that falls within the ranges listed above.

The temperature range is quite broad at 68 to 79°F (20 to 26°C), giving you a lot of flexibility. The middle of this range, around 72 to 76°F (22 to 24°C), is where most keepers find them most active and colorful. They’ll tolerate the lower end of the range just fine, but they’re not as cold-hardy as zebra danios or white cloud mountain minnows. If your room temperature stays above 68°F, you may not need a heater, but having one for stability during winter months isn’t a bad idea.

Filtration & Water Flow

A gentle to moderate flow works best for gold ring danios. In the wild, they come from streams with some current, so they’re comfortable with water movement, but they’re small fish that can be overwhelmed by strong flow. A sponge filter is the ideal choice for a dedicated gold ring danio tank. It provides gentle filtration without creating currents that push these little fish around, and the sponge surface grows biofilm that the danios will pick at between meals.

For community setups, a small hang-on-back filter with an adjustable flow or a baffle works well. Just make sure the intake is covered with a sponge prefilter to prevent these tiny fish (or their fry) from getting sucked in. Good biological filtration is more important than powerful mechanical filtration for a nano tank, you want stable water chemistry, not a whirlpool.

Lighting

Standard aquarium lighting is perfectly fine for gold ring danios. They’re not particularly light-sensitive, and moderate lighting that supports live plant growth is ideal. If you’re running a planted nano tank (which is highly recommended for this species), adjust your lighting to suit the plants first and the fish will be happy.

One thing worth noting is that gold ring danios show their best coloration under moderate lighting with some shaded areas. The contrast between bright and shaded zones makes the spotted pattern pop, especially when the fish move between lit and dimmer areas. Floating plants are great for creating this effect naturally while also helping the fish feel secure.

Plants & Decorations

Gold ring danios look their absolute best in a well-planted tank, and live plants are strongly recommended. Dense planting along the back and sides with open swimming space through the middle and front gives the fish room to school and display while still having places to retreat when they want to feel secure. Java moss, java fern, Anubias nana, Bucephalandra, and various stem plants all work beautifully in a gold ring danio tank.

For hardscape, small pieces of driftwood and smooth river stones create a natural-looking stream biotope that mirrors their wild habitat. Leaf litter (Indian almond leaves or similar) adds tannins that slightly soften and acidify the water, which these fish appreciate. The leaves also grow a film of biofilm and microorganisms that the danios will graze on, providing a natural food supplement between feedings.

Floating plants like Amazon frogbit, red root floaters, or salvinia complete the look and provide shade that makes the fish feel comfortable. Just don’t let floaters cover more than about 50% of the surface so you maintain good light penetration for your rooted plants below.

Substrate

Gold ring danios aren’t bottom dwellers, so the substrate is more about aesthetics and plant health than fish preference. A dark substrate, black sand, dark gravel, or a planted tank soil like Fluval Stratum or ADA Amazonia, will make the gold and dark tones in their spotted pattern stand out much more than a light-colored substrate would. The contrast really matters with a fish this small and intricately patterned.

Fine sand or small-grained gravel works well if you want a natural stream look. If you’re running a planted tank, an active soil substrate gives your plants the nutrients they need while also helping maintain the slightly acidic, soft water conditions that gold ring danios prefer. It’s a win on both fronts.

Is the Gold Ring Danio Right for You?

Before you buy, run through this honest checklist. The Gold Ring Danio is a great fish for the right keeper, but it is not for everyone.

• You have a dedicated nano tank (10-15 gallons) for micro species
• You can keep a group of 10+ for visible schooling behavior
• Your tank has no fish large enough to eat a 1-inch adult
• You use sponge filtration or intake guards to prevent fish being sucked up
• You enjoy keeping rare, tiny species that most hobbyists have never seen
• You want a danio with warm golden ring markings on a tiny body

Tank Mates

Gold ring danios are peaceful nano fish that do best with other small, non-aggressive species. The most important consideration is size, at just 1 inch (2.5 cm), gold ring danios can be intimidated by or even become snacks for larger fish. Stick with similarly sized tank mates that share their temperament and water parameter preferences.

Best Tank Mates

• Celestial pearl danios, from the same region of Myanmar, nearly identical care requirements, and a beautiful contrast in pattern
• Ember tetras, tiny, peaceful, and their warm orange color complements the gold ring danio’s spotted pattern perfectly
• Chili rasboras and other Boraras species, another great nano fish that occupies similar tank levels without competing
• Pygmy corydoras, small bottom dwellers that stay out of the danios’ way and help clean up fallen food
• Otocinclus catfish, gentle algae eaters that add utility to a nano community without causing any conflict
• Cherry shrimp, safe with gold ring danios, though very small shrimplets will be picked off
• Amano shrimp and nerite snails, excellent cleanup crew members that gold ring danios will completely ignore
• Emerald dwarf rasboras, another small, peaceful species that thrives in similar water conditions
• Endler’s livebearers, colorful, active, and similarly sized nano fish that make lively tank mates

Tank Mates to Avoid

• Any fish large enough to eat them, this includes most medium-sized community fish like standard tetras, barbs, and gouramis. A 1-inch fish is a snack for anything with a big enough mouth.
• Aggressive or territorial species, cichlids (even small ones like rams) and aggressive barbs like tiger barbs will harass or eat gold ring danios
• Bettas, while a betta will not eat an adult gold ring danio, the temperament mismatch and risk of aggression makes this a pairing to avoid
• Large shrimp predators, if you’re keeping a shrimp-and-danio community, avoid anything that hunts invertebrates aggressively
• Very large or boisterous fish, even peaceful larger fish can outcompete gold ring danios for food simply by being faster and bigger

Food & Diet

Gold ring danios are omnivores with small mouths, so food size matters as much as food quality. They need small-particle foods that they can actually eat. Crushing standard flake food into a fine powder works in a pinch, but purpose-made micro pellets or nano fish foods are a much better daily staple. Brands that make foods specifically for small-mouthed fish will be your best bet.

Supplement the staple diet with frozen or live foods several times per week. Baby brine shrimp, micro worms, daphnia, and finely chopped bloodworms are all excellent options. Live foods in particular will trigger feeding excitement and bring out brighter coloration. Gold ring danios are surface and mid-water feeders by nature, so foods that float or sink slowly will be eaten more readily than anything that drops straight to the bottom.

Feed small amounts once or twice daily, just enough for the fish to consume within a minute or two. With nano fish, overfeeding is a bigger risk than underfeeding because excess food fouls the water quickly in a small tank. A varied diet that includes both dry and frozen/live foods will keep your gold ring danios healthy, colorful, and active.

Breeding & Reproduction

Gold ring danios are egg scatterers that can be bred in captivity, though it takes a bit more effort than breeding zebra danios. They’ll scatter eggs among fine-leaved plants or over substrate, and, like most danios, they’ll eat the eggs immediately if given the chance. Successful breeding requires separating the adults from the eggs quickly or using a setup designed to protect the eggs.

Breeding Difficulty

Moderate. Getting gold ring danios to spawn isn’t particularly difficult, especially in a well-conditioned group. The challenge is more about raising the very small fry, which need tiny first foods and careful attention to water quality during the first few weeks. If you’ve successfully bred other small danios or rasboras, you’ll have a good foundation for working with this species.

Spawning Tank Setup

Set up a small breeding tank of 5 to 10 gallons with a thin layer of glass marbles or a mesh grid over the bottom to catch eggs and prevent the adults from reaching them. Add generous clumps of java moss or spawning mops, which give the fish surfaces to scatter eggs on and provide additional protection for any eggs that stick. A gentle air-driven sponge filter is all you need for filtration, keep the flow minimal.

Keep the lighting low to moderate and provide some floating plants for cover. The idea is to create a calm, secure environment where the fish feel comfortable enough to spawn. Bare tanks stress nano fish, so a few plants and some structure go a long way.

Water Conditions for Breeding

Target slightly warmer water in the 75 to 78°F (24 to 26°C) range to encourage spawning activity. A pH around 6.5 to 7.0 and soft water between 2 and 6 dGH is ideal. If your tap water is harder than this, mixing with RO (reverse osmosis) water can help bring it into range. A small water change with slightly cooler water will act as a spawning trigger, simulating the rain events that prompt spawning in their native habitat.

Conditioning & Spawning

Condition your breeding group with frequent feedings of high-quality live and frozen foods for a week or two before moving them to the spawning tank. Baby brine shrimp, daphnia, and micro worms are all excellent conditioning foods. You’ll know females are ready when they appear visibly plumper with eggs. Use a ratio of about 2 males per female for the best results.

Introduce the conditioned fish to the breeding tank in the evening. Spawning usually occurs in the early morning hours, often right around dawn when the first light hits the tank. Males will actively chase and display for the females, and eggs are scattered among plants and across the substrate. The clutch size is relatively small compared to larger danio species, expect somewhere around 30 to 50 eggs per spawning event. Remove the adults immediately after spawning is complete to prevent egg predation.

Egg & Fry Care

Gold ring danio eggs are tiny, clear, and adhesive. They typically hatch in 48 to 72 hours at around 76°F (24°C). The newly hatched fry are extremely small, smaller than zebra danio fry, and will absorb their yolk sac over the first 24 to 48 hours before becoming free-swimming. At this point, they need the smallest foods available: infusoria, vinegar eels, or commercial liquid fry food for the first week to 10 days.

Once the fry are large enough (usually around 7 to 10 days old), they can transition to freshly hatched baby brine shrimp, which is the best food for rapid, healthy growth. Keep the fry tank scrupulously clean with small, gentle water changes every day or two. Use airline tubing to siphon carefully so you don’t suck up any fry. Growth is steady but not fast, expect the juveniles to reach recognizable color and pattern at around 4 to 6 weeks, and sellable size at around 2 to 3 months.

Common Health Issues

Gold ring danios are hardy little fish that don’t suffer from species-specific diseases. Like all small freshwater fish, they can run into the standard health problems when water quality slips or stress levels rise. Keeping their tank clean and stable is the best prevention against all of these issues.

Ich (White Spot Disease)

Ich is the most common freshwater fish disease and can affect gold ring danios just like any other species. You’ll see small white spots on the body and fins, along with scratching behavior and clamped fins. Treat with a quality ich medication at the first sign of symptoms. With nano fish, be cautious about dosing, follow instructions carefully and consider half-doses if the medication label suggests it for sensitive species. Gradually raising the temperature to 82°F (28°C) during treatment speeds up the parasite’s life cycle and makes the medication more effective.

Velvet Disease

Velvet is caused by the parasite Oodinium and presents as a fine, dusty gold or rust-colored coating on the skin. It can be easy to miss on gold ring danios specifically because the fish’s natural golden coloring can mask the early stages. Watch for behavioral cues like lethargy, loss of appetite, and clamped fins. Treat with a copper-based medication and dim the lights during treatment, since the parasite has a photosynthetic stage in its life cycle.

Fin Rot

Fin rot shows up as fraying, ragged, or disintegrating fin edges and is almost always a secondary condition caused by poor water quality or stress. In a nano tank, water quality can deteriorate quickly due to the smaller volume, so staying on top of water changes is critical. Improve water conditions first, that alone often resolves mild cases. For more advanced fin rot, an antibacterial medication may be necessary.

Internal Parasites

Wild-caught gold ring danios (and many still come from wild-collected stock) will carry internal parasites. Signs include a hollow belly despite regular feeding, stringy white feces, and gradual wasting. If you suspect parasites, treat with a medicated food containing an antiparasitic agent. Quarantining new fish for 2 to 4 weeks before adding them to an established tank is the best way to catch these issues before they spread.

Common Mistakes to Avoid

• Keeping too few. Gold ring danios need a group of at least 8 to feel secure and display natural behavior. In small numbers, they become shy, stressed, and lose their color. The sparring behavior between males, one of the best features of this species, only really emerges in larger groups.
• Tank mates that are too large. A 1-inch fish is vulnerable to predation from anything medium-sized or larger. Don’t house gold ring danios with fish that could fit them in their mouth. Stick to nano-appropriate tank mates.
• Feeding food that’s too large. Gold ring danios have tiny mouths. Standard-sized flake food and pellets won’t work. Use micro pellets, crushed flakes, or nano-specific foods to make sure they can actually eat what you’re offering.
• Skipping the lid. Danios are jumpers, and gold ring danios are no exception despite their small size. Always use a tight-fitting lid with no gaps large enough for a 1-inch fish to squeeze through.
• Neglecting water changes in nano tanks. Small tanks can swing in water chemistry much faster than larger ones. Consistent, weekly water changes of 20 to 30% are essential to keep conditions stable and healthy in a nano setup.
• No plants or cover. Gold ring danios come from well-vegetated streams. A bare tank with no plants or hiding spots will stress them out and wash out their coloration. Give them a planted environment and they’ll reward you with much better color and behavior.

Where to Buy

Gold ring danios are not a species you’ll find at most chain pet stores. They’re a specialty nano fish that will show up at well-stocked independent fish stores or through online retailers that focus on rare and unusual freshwater species. If your local fish store doesn’t carry them, ask if they can special order, some wholesalers do carry Danio tinwini, especially when seasonal shipments come in from Myanmar.

For the most reliable availability, I’d recommend checking Flip Aquatics or Dan’s Fish. Both are reputable online retailers that regularly stock nano and specialty species, and they ship healthy fish in excellent condition. Online ordering is honestly your best bet for a species like the gold ring danio that isn’t part of the standard big-box store inventory.

Frequently Asked Questions

Are gold ring danios the same as leopard danios?

No. The leopard danio is a spotted variant of the zebra danio (Danio rerio) that reaches about 2 inches and has a much larger, less defined spotted pattern. The gold ring danio (Danio tinwini) is a completely separate species, much smaller at just 1 inch, with a more refined, intricate spot pattern featuring the distinctive golden rings around each dark spot. They’re different fish with different care requirements and sizes.

How many gold ring danios should I keep?

A minimum of 8, and more is better. Gold ring danios are social schooling fish that become stressed and dull-colored in small groups. In groups of 10 or more, you’ll see the most natural behavior, including the entertaining sparring displays between males. The more fish in the group, the more confident they’ll be and the better they’ll look.

Can gold ring danios live with celestial pearl danios?

Absolutely. This is actually one of the best pairings in the nano fish hobby. Both species come from the same region of Myanmar, share nearly identical water parameter requirements, and are similarly sized. They also occupy slightly different areas of the tank, gold ring danios will swim more actively through the mid-water, while CPDs often hover closer to plants and cover. The visual contrast between the two species’ patterns is striking.

Do gold ring danios jump?

Yes. Like all danios, gold ring danios are capable jumpers and can leap out of uncovered tanks. Males chasing each other during sparring displays are especially prone to jumping. Always keep a tight-fitting lid on any tank housing danios. Even small gaps around filter intakes or airline tubing can be escape routes for a fish this small.

Are gold ring danios hard to keep?

Not at all. They’re hardy, adaptable, and tolerant of a broad range of water conditions. The only extra consideration compared to keeping larger community fish is the small food size they require and the importance of stable water parameters in a nano tank. If you can maintain a basic planted nano aquarium and feed appropriately sized foods, you can keep gold ring danios successfully. They’re a great species for someone stepping into nano fishkeeping for the first time.

What do gold ring danio males do when they spar?

Male gold ring danios engage in frequent but harmless sparring matches where they circle each other, flare their fins, and briefly chase one another around the tank. It looks intense if you’ve never seen it before, but no damage is done, it’s all posturing and display. These sparring bouts are one of the most entertaining behaviors you’ll see in a nano tank, and they happen multiple times throughout the day. It’s one of the main reasons hobbyists love this species.

How the Gold Ring Danio Compares to Similar Species

Gold Ring Danio vs. Glowlight Danio

The Glowlight Danio is significantly larger and works in standard community tanks. The Gold Ring Danio is a micro species that needs a dedicated nano setup. If you have a community tank, go Glowlight. If you have a nano tank, the Gold Ring is the more unique choice.

Gold Ring Danio vs. Exclamation Point Rasbora

Both are micro species that need dedicated nano tanks with sponge filtration. The Exclamation Point Rasbora is slightly smaller and more subtle, while the Gold Ring Danio has warmer coloring. Both are excellent choices for experienced nano keepers.

Closing Thoughts

The gold ring danio is proof that you don’t need a big fish to make a big impression. Danio tinwini packs a remarkable amount of personality and visual interest into a 1-inch package. The spotted pattern is unlike anything else in the danio family, the sparring behavior between males is endlessly entertaining, and their compatibility with other popular nano species makes them a natural fit for small community setups.

If you’re into nano tanks, planted aquariums, or just want something a little different from the usual danio options, the gold ring danio deserves a spot on your shortlist. They’re hardy enough for beginners, interesting enough for experienced keepers, and visually striking enough to hold your attention every time you sit down in front of the tank. Give them a well-planted setup with a good group of their own kind, and they’ll reward you with some of the best micro-scale fishkeeping entertainment in the hobby.

Have you kept gold ring danios? How do they compare to celestial pearl danios in your experience? Drop a comment below!

This guide is part of our Rasboras & Danios: Complete Species Directory. Visit the hub page to explore care guides for all popular rasbora and danio species.

Recommended Video

Check out our danio video for more on these fascinating nano fish, including the gold ring danio:

References

• Danio tinwini (Kullander & Fang, 2003), FishBase
• Danio tinwini Profile, Seriously Fish
• Gold Ring Danio Care Guide, Practical Fishkeeping
• Danio tinwini, The Aquarium Wiki