Ornate Rainbowfish

Rhadinocentrus ornatus

Ornate Rainbowfish is a peaceful middle swimmer.

PeacefulMiddle swimmerBeginner – Intermediate

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

Need help with Ornate Rainbowfish?

Explore compatibility, care or problems using this guide and your aquarium’s conditions.

Quick facts

Adult size: 2–3.9" (5–10 cm)
Aquarium size: 21 US gal (80 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length
Care level: Beginner – Intermediate
Temperament: Peaceful
Swimming zone: Middle swimmer
Temperature: 68–82°F (20–28°C)
pH: 6–7
GH: 0.3–5.6 dGH
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: 21 US gal (80 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length. Plan the layout and stocking within that limit.

Water parameters

Suitable water: temperature 20–28 °C, pH 6–7, GH 0.3–5.6 dGH.

Temperament and compatibility

Ornate Rainbowfish is peaceful and suits calm community fish.

Swimming zone and behavior

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

Feeding

Accepts varied small prey; dietary analysis records terrestrial insects, aquatic fly larvae, copepods and additional pollen/algae.

How to feed aquarium fish — General freshwater community guidance

Before adding this fish

Plan for an aquarium of 21 US gal (80 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length.
Avoid aggressive or highly competitive fish.
Offer a varied diet suited to this species’ documented feeding habits.

Natural habitat and origin

Origin: Australia.

Natural habitat: Coastal freshwater creeks and swamps, often with tannin-stained water.

Similar fish profiles

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

Black Banded Rainbowfish Melanotaenia nigrans Same family Similar care level Same temperament Beginner – Intermediate ≤ 3.9" (≤ 10 cm) 73–82°F (23–28°C) Ajamaru Rainbowfish Melanotaenia ajamaruensis Same family Similar care level Same temperament Beginner – Intermediate ≤ 3.8" (≤ 9.7 cm) 81–86°F (27–30°C) Aru Rainbowfish Melanotaenia picta Same family Similar care level Same temperament Beginner – Intermediate ≤ 4.3" (≤ 11 cm) 72–79°F (22–26°C) Banded Rainbowfish Melanotaenia trifasciata Same family Similar care level Same temperament Beginner ≤ 5.9" (≤ 15 cm) 80–85°F (26.7–29.4°C) African Banded Barb Enteromius fasciolatus Similar care level Same temperament Same swimming zone Beginner – Intermediate ≤ 2.4" (≤ 6 cm) 68–79°F (20–26°C) African Butterfly Cichlid Anomalochromis thomasi Similar care level Same temperament Bottom dweller Beginner – Intermediate ≤ 3.1" (≤ 8 cm) 73–81°F (23–27°C)

FAQ

How large does Ornate Rainbowfish get?

Ornate Rainbowfish reaches 2–3.9" (5–10 cm).

What aquarium size does Ornate Rainbowfish need?

Use an aquarium of at least 21 US gal (80 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length.

Is Ornate Rainbowfish peaceful?

Yes. Ornate 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 Ornate Rainbowfish?

Keep it between 20 to 28 °C.