MelanotaeniidaeFreshwater Fishadvanced

Ornate Rainbowfish

Rhadinocentrus ornatus

Origin: Coastal Queensland, Australia

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Water Parameters

Temperature2026 °C
15 °C35 °C
pH5.57
49
GH (Hardness)06 °dGH
0 °dGH30 °dGH
KH (Alkalinity)03 °dKH
0 °dKH20 °dKH

Quick Stats

Max Size
5 cm
Min Tank
60 L
Lifespan
3–5
Swimming Level
middle
Schooling
Yes (6+)
Diet
omnivore
Temperament
Very peaceful; delicate

About

Rhadinocentrus ornatus, the Ornate Rainbowfish or Soft-Spined Sunfish, is a beautiful and rarely seen species from Queensland, Australia. It inhabits tea-coloured, soft, acidic coastal streams — quite different from most rainbowfish. Males display red to orange fin markings with a shimmering iridescent body. Requires soft, slightly acidic water to thrive; unsuitable for hard Belgian tap water without RO treatment. A true specialist's fish, increasingly captive-bred by enthusiasts.

Care Guide

Species tank or with other small, gentle soft-water fish. Soft acidic water (pH 5.5–7.0), RO or rainwater recommended. Temperature 20–26 °C. Feed micro-pellets, baby brine shrimp, daphnia. Gentle filtration. 60+ L.

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