Do Exclamation Point Rasboras need a heater?

Yes. They are tropical fish originating from Southeast Asia and require a stable temperature between 22°C and 27°C to thrive.

What do Exclamation Point Rasboras eat?

Because of their minute mouths, they need micro-foods. You should offer finely crushed high-quality flake, micro-pellets, and tiny live or frozen foods like baby brine shrimp and microworms.

Can I keep them with a Betta fish?

It is generally a risk. While a heavily planted tank might allow them to coexist with a very placid Betta, many Bettas will predate on fish this small.

How many Exclamation Point Rasboras should I keep together?

A minimum group of 8 to 10 is strongly recommended. They are a highly gregarious schooling species and rely on numbers to feel secure and display their best behaviours.

Are they safe to keep with cherry shrimp?

Yes, they are arguably one of the most shrimp-safe fish available. Their mouths are far too small to pose a threat to anything but the absolute tiniest, newly hatched shrimp.

FreshwaterTropicalIntermediate

Exclamation Point Rasbora

Boraras urophthalmoides

A tiny, peaceful schooling fish from Southeast Asian swamps, famous for its distinctive exclamation mark patterning and vibrant orange-red stripe.

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Ideal Conditions

Temperature: 22 – 27 °C
pH range: 5 – 7
Hardness: 1 – 10 dGH
Adult size: 1.2 – 1.6 cm
Nano tank: 30 litres+
Lifespan: 3 – 5 years
Diet: Micro-predator
Water flow: gentle
Preferred setup: Heavily planted with floating plants, dark substrate, and leaf litter.

About the Exclamation Point Rasbora

The Exclamation Point Rasbora (Boraras urophthalmoides) is among the smallest fish routinely encountered in the aquarium hobby. Native to the slow-moving, tannin-stained waters of Southeast Asia, these diminutive cyprinids are highly sought after by nano aquarium enthusiasts. Their common name derives from the dark lateral stripe that breaks just before a distinct dark spot at the caudal peduncle, forming an exclamation mark. Despite their tiny size, a healthy shoal will bring vibrant movement and delicate beauty to a heavily planted setup.

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Is it right for your tank?

Check Exclamation Point Rasbora against a habitat you already keep. We compare water type, temperature, pH, adult size, group needs and everything living there.

Where Exclamation Point Rasbora comes from

Native range

Southeast Asia

Countries / regions

Thailand, Vietnam, Cambodia

Habitat

Slow-moving, tannin-stained peat swamps, marshes, and heavily vegetated forest streams.

Populations are somewhat fragmented across the lower Mekong and Chao Phraya river basins.

Similar species

Mosquito Rasbora
Boraras brigittae
Dwarf Rasbora
Boraras maculatus
Phoenix Rasbora
Boraras merah
Neon Green Rasbora
Microdevario kubotai

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Cherry Shrimp
Neocaridina davidi
Exclamation Point Rasboras have minute mouths and are one of the few fish species entirely safe to house with breeding dwarf shrimp.
Great
Pygmy Corydoras
Corydoras pygmaeus
A perfectly sized, peaceful bottom-dweller that will not compete for swimming space or predate on the rasboras.
Great
Otocinclus
Otocinclus macrospilus
Gentle, small algae-grazers that share the same water parameter requirements and pose absolutely no threat.
Great
Siamese Fighting Fish
Betta splendens
Due to the rasbora's extremely small adult size, many Bettas will view them as a snack. Coexistence is only possible in large, heavily planted tanks with a placid Betta.
Compatible with caution
Angelfish
Pterophyllum scalare
Angelfish grow significantly larger and are opportunistic predators; they will easily consume these tiny rasboras.
Not recommended

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