Australian Rainbowfish

Melanotaeniidae sp.

Australian Rainbowfish (Melanotaeniidae sp.) — Intermediate care, Peaceful, under Rainbowfish. Minimum tank in the app: 30 US gal min; aim for 68–77°F and pH 6.5–8. The Australian Rainbowfish is ideal for aquarists seeking active, visually appealing species in a community setting.

Australian Rainbowfish (Melanotaeniidae sp.) in a planted freshwater aquarium
Care levelIntermediate
TemperamentPeaceful
Min tank size30 US gal min
pH range6.5–8
Temperature68–77°F
Max size4.3 in (11.0 cm)
Captive lifespan6–10 years
SchoolingYes · 6+ recommended

Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.

Natural distribution

Australia / New Guinea

  • Australia & Oceania

Regional colours match the stocking calculator’s origin map.

Australian Rainbowfish Tank Setup

A balanced environment is crucial; provide ample mid to top-level swimming space alongside visual barriers like plants and driftwood. A gentle water flow mimics their natural habitat, while a sandy or fine substrate allows for comfortable foraging. Lighting should enhance their colors, but avoid extremes that could stress them—consider a planted layout for both aesthetic appeal and security.

What Do Australian Rainbowfishs Eat?

As omnivores, they enjoy a varied diet, but watch for competition during feeding times, particularly in larger groups. Fast-moving or aggressive eaters may outcompete them for food, leading to nutritional deficiencies.

Australian Rainbowfish Tank Mates

Ideal companions include other mid-water swimmers of similar size and temperament, such as smaller tetras and rasboras. Caution with larger, more aggressive species is essential, as they can intimidate or harm the rainbowfish. Within their own species, maintaining a minimum group size of six helps prevent hierarchical stress and promotes a cohesive social structure.

Are Australian Rainbowfishs Good for Beginners?

We rate this as intermediate. Budget time for testing, maintenance, and watching behaviour if the water looks fine but the fish do not. Many aquarists underestimate the importance of group size and tank structure, leading to stressed fish and diminished color. Inadequate swimming space and insufficient cover can trigger territorial disputes or social withdrawal.

Building a community? Run the full list through the stocking calculator before you add anything else.

Log tests and reminders in App-aquatic—free, same data you see here.