Description
Overview
The Mosquito Rasbora (Boraras brigittae) is a tiny, vibrant freshwater fish that is highly sought after for nano and planted aquariums. Recognized for its striking red coloration and black lateral stripe, this species brings a splash of colour and activity to peaceful community tanks. Due to their small size and schooling nature, they are best kept in groups of six or more to ensure a comfortable and natural environment.
Origin
Native to the blackwater streams and peat swamps of Borneo, specifically in Indonesia, Mosquito Rasboras thrive in slow-moving, tannin-rich waters with dense vegetation. Their natural habitat features soft, acidic water, which should be replicated in the home aquarium for optimal health.
Feeding
Mosquito Rasboras are micro-predators, meaning they feed on tiny invertebrates, insect larvae, and zooplankton in the wild. In captivity, they readily accept:
High-quality micro pellets
Crushed flake food
Live or frozen foods such as daphnia, baby brine shrimp, and microworms
Providing a varied diet ensures they receive proper nutrition and maintain their vibrant colours.
Tank Mates
Due to their peaceful nature and small size, Mosquito Rasboras should be housed with similarly sized, non-aggressive species. Ideal tank mates include:
Other Boraras species (e.g., Chilli Rasbora, Phoenix Rasbora)
Small Tetras (such as Ember Tetras)
Dwarf Corydoras (e.g., Pygmy Cory)
Small shrimp (e.g., Neocaridina or Caridina species)
Snails (such as Nerite or Ramshorn snails)
Avoid larger or boisterous fish, as Mosquito Rasboras can easily become stressed or outcompeted for food.
Aggression
These fish are incredibly peaceful and non-aggressive. They prefer to school together, which helps reduce stress and promotes natural behaviours. However, they may become shy or timid if housed with larger or more dominant species.
Experience Level
Beginner to Intermediate. While not overly difficult to keep, Mosquito Rasboras require stable water conditions, soft acidic water, and a well-established aquarium, making them better suited for aquarists with some experience.
Water Parameters
Temperature: 22°C – 28°C (72°F – 82°F)
pH: 4.0 – 7.0 (Preferably on the acidic side)
Hardness: 1 – 10 dGH (Soft water)
Tank Size: Minimum 10 gallons (best kept in larger groups)
Filtration: Gentle flow, preferably with a sponge or low-flow filter to mimic their natural environment
Final Thoughts
Mosquito Rasboras are a stunning addition to peaceful, well-planted aquariums. Their striking colours, active schooling behavior, and low aggression make them ideal for nano tanks and blackwater biotopes. By providing the right water conditions and compatible tank mates, they will thrive and display their best colours in the home aquarium.