Least Rasbora (Boraras urophthalmoides)
R35,00
The Least Rasbora is one of the smallest freshwater fish in the aquarium hobby, known for its delicate beauty and calm nature. With its translucent golden body, subtle red hues, and distinctive tail spot, this species adds movement and colour to nano and planted tanks without disturbing the environment.
The Least Rasbora is one of the smallest freshwater fish in the aquarium hobby, known for its delicate beauty and calm nature. With its translucent golden body, subtle red hues, and distinctive tail spot, this species adds movement and colour to nano and planted tanks without disturbing the environment.
Facts
Scientific Name: Boraras urophthalmoides
Common Name: Least Rasbora
Size: 1.5–2 cm
Lifespan: 3–5 years
Origin: Southeast Asia (Thailand, Cambodia, Vietnam)
Difficulty: Easy
Tank Requirements
Minimum Tank Size: 20 litres
Temperature: 22–28 °C
pH: 6.0–7.5
GH: 2–10 dGH
KH: 1–6 dKH
Preferred Setup: Heavily planted aquarium with floating plants and subdued lighting
Filtration: Gentle flow, as they prefer calm waters
Behaviour and Tank Mates
Peaceful, schooling fish that should be kept in groups of at least 8–10
Ideal for nano and community aquariums with other small, peaceful species
Great tank mates include small shrimp, pygmy Corydoras, Otocinclus, and other Boraras species
Timid when kept alone — thrives in larger groups
Diet
Omnivorous micro-predators
Accepts high-quality micro pellets, crushed flakes, and frozen or live foods such as baby brine shrimp, daphnia, and microworms
Regular feeding of live or frozen foods enhances colour and activity
Breeding
Egg-scattering species; no parental care
Best bred in a separate breeding tank with fine-leaved plants or moss for egg protection
Fry are tiny and require infusoria or liquid fry food initially
Frequent water changes and stable conditions improve success
Care Tips
Keep water clean with regular small water changes
Provide a dark substrate and floating plants to bring out their natural colours
Avoid aggressive or large tank mates
Maintain a stable temperature and soft, slightly acidic water
Why You Want Them
The Least Rasbora is perfect for aquarists who appreciate tiny, peaceful schooling fish. Their subtle colours, elegant swimming behaviour, and compatibility with shrimp and nano species make them an excellent choice for small planted aquariums. Despite their size, they bring a lively, natural dynamic to any tank.
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