Western Rainbowfish

Melanotaeniidae sp.

Western Rainbowfish (Melanotaeniidae sp.) — Intermediate care, Peaceful, under Rainbowfish. Minimum tank in the app: 30 US gal min; aim for 72–81°F and pH 6.5–8. The Western Rainbowfish appeals to both seasoned aquarists and beginners drawn to dynamic, colorful schooling fish, but they thrive best in larger, well-planted environments.

Western Rainbowfish (Melanotaeniidae sp.) in a planted freshwater aquarium
Care levelIntermediate
TemperamentPeaceful
Min tank size30 US gal min
pH range6.5–8
Temperature72–81°F
Max size4.7 in (12.0 cm)
Captive lifespan6–12 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.

Western Rainbowfish Tank Setup

Aim for a spacious layout with ample mid and upper water column swimming zones. Incorporate vegetation for cover and a varied substrate to mimic their natural habitat. Moderate flow can stimulate their activity levels, while subdued lighting can enhance their coloration and reduce stress, allowing for a more naturalistic ambiance.

What Do Western Rainbowfishs Eat?

Western Rainbowfish are omnivorous with a moderate feeding speed, and they thrive on a varied diet that includes flakes, pellets, and occasional live or frozen foods. Ensure even distribution during feeding to reduce competition, as they can be outcompeted by faster or more aggressive feeders, which may impact their health and vibrancy.

Western Rainbowfish Tank Mates

This species integrates well with other peaceful community fish of similar size. Ideal companions include small to medium-sized tetras, livebearers, and other non-aggressive schooling species. Be cautious with larger, boisterous fish that might overshadow the rainbows or compete for the same swimming area; maintaining at least six individuals from the same species is essential to prevent stress or bullying.

Are Western 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. Aquarists often underestimate the required group size, leading to stress and reduced display behavior. failure to create a balanced environment with sufficient cover and swimming space can result in territorial disputes or a lack of confidence.

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.