Goldie River Rainbowfish – Dekai (Melanotaenia cf. goldiei “Dekai”)
The Goldie River Rainbowfish – Dekai, Melanotaenia cf. goldiei “Dekai”, is a larger New Guinea rainbowfish locality form valued for its active shoaling behaviour, metallic body sheen and colourful mature males. Depending on age, mood and lighting, males may show blue, green, gold, orange or red tones with stronger fin colour and a deeper body shape as they mature. This is a peaceful but energetic rainbowfish best suited to spacious planted aquariums with open swimming room, excellent water quality and a proper group.
Common Name:
Goldie River Rainbowfish – Dekai, Goldie Rainbowfish Dekai, Dekai Goldiei Rainbowfish, Goldie River Rainbowfish.
| Species | Melanotaenia cf. goldiei “Dekai” |
|---|---|
| Origin | New Guinea |
| Behaviour | Shoaling, peaceful, active |
| Adult Size | Up to 8 cm (3.1 inches) |
| Water Conditions | Temperature: 22–28°C, pH: 6.0–7.5, Hardness: 2–10 dGH |
| Group Size | 6 or more fish recommended |
FAQ
What is the typical size of a mature Goldie River Rainbowfish – Dekai?
Mature Goldie River Rainbowfish – Dekai can grow up to 8 cm (3.1 inches) in length.
How should I set up the aquarium for this fish?
Provide a spacious planted aquarium with open swimming space, good water quality, and a group of at least six fish.
Do males display different colours as they mature?
Yes, males may show blue, green, gold, orange, or red tones depending on age, mood, and lighting, with stronger fin colour and a deeper body shape as they mature.
Liam May –
The fish are very active and colorful, especially when the lights are on. I kept them in a 120-liter tank with plenty of plants and they form a nice shoal. The males show vibrant colours as they grow older. Easy to care for as long as water parameters are stable.
Liam King –
Great addition to a planted tank. They swim freely and interact well with other peaceful fish. The colour change in males is noticeable after a few months. Needs a group to feel comfortable.
Maria Kelly –
Highly recommended for aquarists who enjoy dynamic, visually appealing fish. The metallic sheen and shifting hues are stunning. I’ve kept them for over a year with no health issues.