Lacrimula Rasbora (Rasbora lacrimula), also known as the Red Cherry Rasbora or Borneo Redfin Rasbora, is a small, peaceful freshwater fish native to Indonesian Borneo. It’s a relatively new addition to the aquarium hobby and prized for its subtle beauty and calm temperament.

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Species Overview

• Scientific Name: Rasbora lacrimula
• Common Names: Red Cherry Rasbora, Borneo Redfin Rasbora, Sunshine Rasbora, Dwarf Volcano Rasbora 
• Origin: Mahakam drainage, Kalimantan Timur, Borneo, Indonesia
• Size: 25–31 mm (1–1.2 inches)
• Lifespan: ~3–5 years
• IUCN Status: Data Deficient 

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Appearance

• Body: Slender and semi-transparent with a faint midlateral stripe
• Markings: Ends in a teardrop-shaped blotch near the caudal peduncle
• Unique Feature: A line of tiny tubercles forming a granulated crest along the dorsal surface and upper edge of the caudal fin 
• Sexual Dimorphism:
  • Males: Smaller, slimmer, more intensely colored
  • Females: Fuller-bodied when mature 

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Tank Setup

• Minimum Tank Size: 45 × 30 cm (approx. 10–15 gallons) 
• Water Temperature: 72–78°F (22–25.6°C)
• pH: 4.0–7.5 (soft, slightly acidic preferred)
• Hardness: 1–12 dGH
• Décor:
  • Dark substrate
  • Leaf litter, driftwood, and roots
  • Floating plants to diffuse light
• Filtration: Gentle flow; avoid strong currents

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Diet

• Type: Micropredator
• Foods:
  • Live/frozen: Daphnia, Artemia, mosquito larvae
  • Dry: Micro pellets, flakes
• Feeding Tip: A varied diet enhances coloration and breeding readiness 

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Behavior & Compatibility

• Temperament: Very peaceful
• Shoaling: Must be kept in groups of 8–10+ for natural behavior and best coloration
• Tank Mates: Suitable with other small, peaceful fish like tetras, small rainbowfish, and dwarf catfish 

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Breeding

• Method: Egg-scattering, continuous spawner
• Spawning Setup:
  • Shallow tank with mesh or marbles to protect eggs
  • Dim lighting and soft, acidic water
• Eggs: Hatch in 18–48 hours; fry become free-swimming within 1–2 days
• Fry Food: Start with Paramecium or infusoria, then Artemia nauplii

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