Macculloch’s Dwarf Rainbowfish (Tank-Bred)
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Macculloch’s dwarf rainbowfish (Melanotaenia maccullochi) is a beautiful and well-known species in the aquarium hobby, often confused with the neon dwarf rainbowfish (Melanotaenia praecox) due to similar common names. While both are small, peaceful, and popular, they have distinct appearances and are from different regions.
These fish enjoy being kept in large schools as their most intense color will be displayed. A spacious aquarium will help ensure that subdominant males are not overly harassed by dominant males.
| Feature | Detail |
|---|---|
| Scientific Name | Melanotaenia maccullochi |
| Size | Up to 2.5 inches (6 cm) |
| Temperament | Peaceful, social |
| Group Size | Best kept in groups of 6 or more |
| Water Temperature | 72–78°F (22–26°C) |
| Water pH | 6.0–7.5 |
FAQ
What is the difference between Macculloch’s dwarf rainbowfish and neon dwarf rainbowfish?
Macculloch’s dwarf rainbowfish (Melanotaenia maccullochi) and neon dwarf rainbowfish (Melanotaenia praecox) are similar in size and temperament but differ in appearance and origin. Macculloch’s has a more vibrant red and blue coloration, while neon dwarf rainbowfish tend to have a more uniform, neon-like hue. They are from different geographic regions and should not be confused.
How many fish should I keep to see the best color display?
To see the most intense color display, keep at least six Macculloch’s dwarf rainbowfish together. They are social and thrive in groups, which enhances their natural behavior and coloration.
What is the ideal water temperature for these fish?
The ideal water temperature range is between 72–78°F (22–26°C). Maintaining a stable temperature within this range supports their health and color development.
Donna Kerr –
I bought a group of six Macculloch’s dwarf rainbowfish and they’ve been thriving in my 20-gallon tank. The colors are vibrant, especially when the tank is well-lit. They swim together in a school, which is very peaceful and adds a lot of visual appeal to the aquarium.
Pippa Clark –
The fish arrived healthy and were active right after setting up the tank. I was a bit worried about the size, but they fit well in a medium-sized tank. I now keep them in a group of eight, and their colors have become more intense over time.
Una Ogden –
These fish are very easy to care for and very peaceful. I didn’t have any issues with aggression, even with males. The school behavior is natural and adds a dynamic look to the tank.