What tank size do I need?

Since adults reach only about 2-3cm, they can be kept in a small tank. However, since they shoal naturally, a somewhat larger tank is reassuring when keeping several together.

Can they be kept with other fish?

They're peaceful and do well with calm tankmates of similar size. Avoid pairing them with larger or more aggressive fish, since they're quite small.

What water temperature is best?

They prefer somewhat cooler temperatures than many relatives in their genus, so aim slightly lower than typical tropical fish setups. Watch for seasonal temperature swings as well.

How can I tell males from females?

Males have deeper body coloration and a reddish tint on their fins. Females look paler overall in comparison.

What should I feed them?

Because their mouths are small, tiny pellets or finely crushed food work best. Foods marketed for small fish are a good starting point.

Emerald Dwarf Rasbora

The Emerald Dwarf Rasbora is a tiny cyprinid fish, reaching only about 2cm in standard length, with an orange body crossed by iridescent green-blue stripes. Native exclusively to Myanmar's Inle Lake, this species shoals gracefully and brings a cool, shimmering presence to a tank. Males display deeper coloration than females, with a reddish tint on their fins that makes them easy to spot within a group. Their temperament is peaceful, making them a good match for tankmates of similar size. Because they prefer hard, slightly alkaline water and cooler temperatures than many relatives in their genus, they're best suited to keepers with some prior aquarium experience.

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About Emerald Dwarf Rasbora

Emerald Dwarf Rasbora: a 2cm cyprinid native to Myanmar's Inle Lake, with an orange body and green-blue stripes. A peaceful shoaling fish suited to intermediate keepers.

7 things to know before welcoming a Emerald Dwarf Rasbora

1Water Chemistry
Native to Myanmar's Inle Lake, this species thrives in hard, slightly alkaline water. Standard tap water is often softer, so mineral supplementation can help maintain stable conditions. Introduce any water changes gradually to avoid shocking the fish.
2Prefers Cooler Water
Compared to related species in its genus, this rasbora prefers relatively cool water temperatures. Pay close attention during summer heat, and consider a cooling fan if temperatures climb too high.
3Tiny, Delicate Body
Adults reach a maximum size of only about 3cm. Because they're so small and delicate, avoid strong filter currents and tankmates that are much larger.
4Best Kept in a Shoal
This species shows its natural behavior best when kept in a shoal rather than alone. Watching males display their coloration to one another adds to the appeal of a shoaling group.
5Telling Males from Females
Males show deeper body coloration and a reddish tint on their fins. Females appear paler overall by comparison.
6Suited to Intermediate Keepers
Because water chemistry and temperature need close attention, this species is generally considered suitable for intermediate keepers. Regular water testing and consistent water changes are key to keeping them healthy.
7Provide Plenty of Cover
Being small and somewhat shy, they settle in better with plenty of plants or driftwood to hide among. It's also important to fully cycle the tank and stabilize water quality before bringing them home.

Frequently asked questions about Emerald Dwarf Rasbora

Q.What tank size do I need?: A.Since adults reach only about 2-3cm, they can be kept in a small tank. However, since they shoal naturally, a somewhat larger tank is reassuring when keeping several together.
Q.Can they be kept with other fish?: A.They're peaceful and do well with calm tankmates of similar size. Avoid pairing them with larger or more aggressive fish, since they're quite small.
Q.What water temperature is best?: A.They prefer somewhat cooler temperatures than many relatives in their genus, so aim slightly lower than typical tropical fish setups. Watch for seasonal temperature swings as well.
Q.How can I tell males from females?: A.Males have deeper body coloration and a reddish tint on their fins. Females look paler overall in comparison.
Q.What should I feed them?: A.Because their mouths are small, tiny pellets or finely crushed food work best. Foods marketed for small fish are a good starting point.

Useful tools for Emerald Dwarf Rasbora care

💧Aquarium Volume CalculatorCalculate water volume, weight, and heater wattage from tank dimensions 🧪Water Quality CheckerFind compatible fish, shrimp, plants & corals based on pH, temperature & hardness 🍽️Feeding GuideCheck feeding frequency, portion sizes & supplements by species and growth stage 🤝Compatibility CheckerCheck compatibility between two species on a 5-level scale 📊Fish Compatibility MatrixCheck fish compatibility at a glance with our matrix chart 🔄Nitrogen Cycle GuideAuto-calculate bacteria colonization timeline for new tank cycling 🗓️Seasonal Care CalendarMonthly care events and seasonal management tips at a glance 🚿Water Change CalculatorAuto-calculate optimal water change frequency and volume by tank size and fish count 🐠Stocking CalculatorCalculate max fish capacity for your tank size with overstocking alerts ⚡Electricity Cost SimulatorCalculate monthly and annual electricity costs for care equipment with presets 🧬Breeding PlannerSelect parent varieties to view breeding schedules and offspring patterns 🏞️Tank Layout PlannerGet substrate, plant & hardscape suggestions based on tank size and style 🧮Care Cost SimulatorEstimate initial, monthly & annual costs by category, care level and quantity ⚖️Species Comparison ToolCompare two species side by side: care difficulty, size, lifespan & temperature 🎯Pet Match DiagnosticAnswer 7 questions to find your top 3 perfect pets 📋Lifetime Cost SimulatorEstimate lifespan and lifetime costs by species for dogs, cats, reptiles and more 🚚Transport Safety CheckerCheck transport safety score and precautions by category, season, method and distance 💊Medication Dosage CalculatorCalculate proper medication dosage by body weight and medicine type for fish, reptiles, and small animals ⏱️Quarantine & Acclimation TimerManage quarantine periods and acclimation steps with countdown timers. Includes recommended durations by species

Learn more about Emerald Dwarf Rasbora in the encyclopedia

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Care difficulty, lifespan, size and diet — all basics covered.

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An introduction to ultra-small tropical fish suited for 15–20L compact aquariums that can be placed on a desktop. This guide explains the characteristics of eye-catching small species such as Boraras brigittae, Scarlet Gems, and Emerald Dwarf Rasboras, as well as compatibility considerations and layout tips.

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