Overview

Family: Melanotaeniidae

Rainbowfish are vibrant, fast-swimming freshwater fish native to Australia, New Guinea, and nearby islands. They are renowned for their iridescent colours that intensify with age, good diet, and proper lighting. Popular species include Boesemani, Australian, Turquoise, and Threadfin Rainbowfish. They thrive in well-planted, spacious aquariums with clean, well-filtered water. Their lively schooling behaviour and peaceful temperament make them ideal for community tanks and a beautiful showcase of Australian aquatic diversity.

Recommended Tank Size: A minimum of 40 litres

Peaceful, schooling fish — best kept in groups of 6 or more
Avoid fin-nippers or very small fish that may be outcompeted for food
Provide open swimming areas with plants around the edges

Average Adult Size:

Body length: 8–15 cm (varies by species)
Reach adult size within 12–18 months
Lifespan: typically 3–15 years
Males develop stronger colours as they mature

Water Parameters:

pH: 6.5–8.0
Alkalinity (KH): 6–15
General Hardness (GH): 8–20
Temperature: 24–28 °C

Food:

Omnivorous and active feeders
Feed a mix of high-quality flakes or pellets, plus frozen or live foods (brine shrimp, daphnia, bloodworms)
Supplement with vegetable-based foods or blanched greens for variety
Feed 1–2 times daily in portions they can finish within a few minutes