Species Highlight

• Size: 4–5 cm

• Temperament: Very peaceful, shy; best with calm nano tankmates

• Origin: Northern Australia & southern New Guinea

• Appearance: Slender silver body with iridescent rainbow sheen; males develop long, thread-like dorsal and anal fins

• Tank Role: Mid–upper water swimmer, elegant and graceful

• Special Feature: One of the most delicate and visually striking nano rainbowfish

Fun Facts

• Male Rainbow Threadfins display dramatically during courtship, flaring their fins like tiny underwater flags.

• Their colors intensify in soft lighting and heavily planted aquariums.

• They prefer slow-moving water and can become stressed in strong currents.

Care Recommendations

• Group size: 6–8+ (keep more females than males)

• Tank size: 15–20 gallons minimum

• Diet: Micro pellets, baby brine shrimp, daphnia, fine frozen foods

• Aquascape: Dense plants, floating cover, gentle filtration

• Tankmates: Small rasboras, ember tetras, pygmy Corydoras

• Water parameters: Soft to neutral water; very stable conditions