Western Rainbowfish

Melanotaenia australis

Western Rainbowfish is a peaceful middle-to-top swimmer.

PeacefulMiddle to top swimmerBeginner – Intermediate

Save this fish or add it directly to one of your aquariums.

Quick facts

Adult size: ≤ 4.7" (≤ 12 cm)
Aquarium size: 32 US gal (120 L) or larger / ≥ 35.4" (≥ 90 cm) minimum length
Care level: Beginner – Intermediate
Temperament: Peaceful
Swimming zone: Middle to top swimmer
Temperature: 72–82°F (22–28°C)
pH: 6–8
GH: 5–20 dGH
KH: 5–10 dKH
Diet: Omnivore
Lifespan: up to 5 years

Care requirements

Care level: Beginner – Intermediate.

Lifespan: up to 5 years.

Aquarium size and space needs

Minimum aquarium size: 32 US gal (120 L) or larger / ≥ 35.4" (≥ 90 cm) minimum length. Plan the layout and stocking within that limit.

Water parameters

Suitable water: temperature 22–28 °C, pH 6–8, GH 5–20 dGH, KH 5–10 dKH.

Temperament and compatibility

Western Rainbowfish is peaceful and suits calm community fish.

Swimming zone and behavior

This fish uses the middle to upper part of the aquarium, so leave enough open swimming space for movement and feeding.

Feeding

As an omnivore, Western Rainbowfish should receive a varied diet rather than one repeated food type.

Before adding this fish

Plan for an aquarium of 32 US gal (120 L) or larger / ≥ 35.4" (≥ 90 cm) minimum length.
Avoid aggressive or highly competitive fish.
Offer a varied diet that matches this species.

Natural habitat and origin

Origin: Australia.

Similar fish profiles

Use these profiles to compare fish with similar care level, size, temperature range, or swimming behavior.

Aru Rainbowfish Melanotaenia picta Same genus Same family Similar care level Beginner – Intermediate ≤ 3.5" (≤ 9 cm) 72–81°F (22–27°C) Black Banded Rainbowfish Melanotaenia nigrans Same genus Same family Similar care level Beginner – Intermediate ≤ 3.9" (≤ 10 cm) 73–82°F (23–28°C) Banded Rainbowfish Melanotaenia trifasciata Same genus Same family Similar care level Beginner ≤ 5.1" (≤ 13 cm) 70–79°F (21–26°C) Ajamaru Rainbowfish Melanotaenia ajamaruensis Same genus Same family Similar care level Beginner – Intermediate ≤ 3.9" (≤ 10 cm) 81–86°F (27–30°C) Boesemans Rainbowfish Melanotaenia boesemani Same genus Same family Similar care level Beginner ≤ 5.1" (≤ 13 cm) 79–86°F (26–30°C) Barred Rainbowfish Chilatherina fasciata Same family Similar care level Same temperament Beginner – Intermediate ≤ 4.7" (≤ 12 cm) 82–90°F (28–32°C)

FAQ

How large does Western Rainbowfish get?

Western Rainbowfish reaches ≤ 4.7" (≤ 12 cm).

What aquarium size does Western Rainbowfish need?

Use an aquarium of at least 32 US gal (120 L) or larger / ≥ 35.4" (≥ 90 cm) minimum length.

Is Western Rainbowfish peaceful?

Yes. Western Rainbowfish is recorded as peaceful and is best planned with calm community fish that do not harass it or dominate the feeding area.

What temperature is suitable for Western Rainbowfish?

Keep it between 22 to 28 °C.