Rasbora rheophila 2-3”

Rheophila rasboras are a small group of stream-dwelling rasboras that live in fast-flowing, well-oxygenated rivers in Southeast Asia, especially Borneo and parts of Indonesia/Malaysia.

 

The name “rheophila” literally means “flow-loving”, which perfectly describes their habitat.

 

 

 

 

Key Characteristics

 

 

• Size: Very small (about 2–4 cm / under 1.5 inches)
• Body shape: Slim and streamlined for swimming against current
• Coloration: Often subtle—silvers, browns, yellows—with some species showing faint stripes or spots
• Behavior: Active, peaceful schooling fish

 

 

 

 

 

Natural Habitat

 

 

Rheophila rasboras are found in:

 

• Clear, shallow forest streams
• Strong current
• Rocky or sandy bottoms
• Leaf litter and submerged roots
• Cooler, oxygen-rich water compared to typical rasbora habitats

 

 

 

 

 

Aquarium Care

 

 

These fish are not beginner-level due to their specialized needs.

 

 

Tank Setup

 

 

• Tank size: 15–20 gallons minimum (long tanks preferred)
• Flow: Strong current (powerheads or river manifold recommended)
• Filtration: High oxygenation
• Substrate: Sand, smooth rocks, driftwood
• Plants: Limited—use hardy species like Anubias or Bucephalandra

 

 

 

Water Parameters

 

 

• Temperature: 20–24°C (68–75°F)
• pH: 6.0–7.0
• Hardness: Soft to moderately soft
• Water quality: Extremely clean—very sensitive to pollution

 

 

 

 

 

Diet

 

 

• Micropredators and insectivores
• Feed:
  
• Live or frozen foods (daphnia, cyclops, baby brine shrimp)
• High-quality micro pellets
• Frequent small feedings work best

 

 

 

 

 

Behavior & Tankmates

 

 

• Peaceful shoaling fish (keep in groups of 6–10+)
• Best with other rheophilic species, such as:
  
• Hillstream loaches
• Small gobies
• Stream-adapted minnows

 

 

 

 

 

Common Species Examples

 

 

• Rasbora rheophila
• Rasbora zosterophora
• Rasbora vaillantii (sometimes grouped with rheophilic forms)

 

 

 

 

If you’d like, I can:

 

• Recommend specific rheophila rasbora species
• Help design a river-style aquarium
• Compare them with hillstream loaches or danios