Aqua-Pedia 🐠 Shared tanks
🌐 English
Fish

Macculloch's rainbowfish

Melanotaenia maccullochi
French name : Poisson arc-en-ciel de Macculloch

Macculloch's rainbowfish is a small, hardy and peaceful species from the coastal creeks, swamps and lagoons of northern Queensland, Australia. Reaching only about seven centimetres, it is an excellent, undemanding rainbowfish for community aquariums and a good choice for beginners. The body is silvery to olive with rows of fine reddish-brown spots forming horizontal lines, and orange-red fins that brighten as males display. It is a shoaling fish that must be kept in groups of six or more, ideally with several males so colour rivalry is spread out. Pair it with other small rainbows, rasboras or peaceful tetras. It tolerates a range of conditions but does best in warm, slightly acidic to neutral, soft to moderately hard water with plants and open swimming space. Feed a varied omnivorous diet of flakes, micropellets and small live or frozen foods.

Water
Freshwater
Origin
Coastal streams of northern Queensland, Australia
Adult size
7 cm
Diet
Omnivore
Temperament
Peaceful
Difficulty
Beginner
Keep in group of
6+
Macculloch's rainbowfish (Melanotaenia maccullochi)
Illustration

Water parameters

Temperature22 – 28 °C
pH6.5 – 7.5
Carbonate hardness (KH)3 – 12 °dKH
General hardness (GH)5 – 15 °dGH

Tank & stocking

Minimum tank volume90 L
Volume budget per individual 12 L — adds up with tank-mates
Minimum group size6 individuals (shoaling)

“Minimum tank volume” is a reasonable floor, not an absolute limit. The per-individual budget is used by the Aqua app to estimate how heavily a tank is stocked.

Frequently asked questions

What size aquarium does Macculloch's rainbowfish need?

Provide at least 90 litres for a small group to keep Macculloch's rainbowfish in good conditions.

What water parameters does Macculloch's rainbowfish need?

A temperature of 22–28 °C, pH 6.5–7.5.

Is Macculloch's rainbowfish peaceful or aggressive?

Its temperament is peaceful.

What does Macculloch's rainbowfish eat?

Its diet: omnivore.

How many Macculloch's rainbowfish should be kept together?

It is a social species: keep a group of at least 6.

How big does Macculloch's rainbowfish get?

Around 7 cm as an adult.

Is Macculloch's rainbowfish suitable for beginners?

Care level: beginner.

Planning a tank with Macculloch's rainbowfish?

AquaTender turns these parameters into live advice: it checks whether your tank is big enough, how heavily it's stocked, and whether your fish are compatible — then tracks water tests, photos and maintenance for you.

➕ Add Macculloch's rainbowfish to my tank Discover AquaTender
« Add to my tank » opens AquaTender — sign in (free) and pick your aquarium.

Fish from the same biotope

Report an error on this page

Care data is community-assisted. Spotted something wrong? Let us know — it won't change the page instantly, but it goes to moderation.

Care data is generated and manually reviewed; always cross-check before major decisions. ← Back to the encyclopedia