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
