Dwarf MacCullochi Rainbow – Medium
The more colorful variety from northern Australia and south-western Papua New Guinea. The smaller size makes it an excellent community fish which tolerates a wide range of conditions.
| Scientific Name | Melanotaenia maccullochi |
|---|---|
| Family | Melanotaenia |
| Origin | Northern Australia (northern Cape York Peninsula) and Southwestern Papua New Guinea |
| Compatibility with Planted Aquariums | Compatible |
| Care and Handling | Contrary to some popular opinion, these Rainbows are very hardy provided you provide adequate space, good filtration (they thrive in planted tanks) and don’t let the water get too hot (>84F). They will handle low temps better than most tropicals. |
FAQ
What is the ideal water temperature for Dwarf MacCullochi Rainbows?
They thrive best below 84°F and can tolerate lower temperatures better than most tropical fish.
Are Dwarf MacCullochi Rainbows suitable for planted tanks?
Yes, they are compatible with planted aquariums and thrive in such environments with good filtration.
How much space do they need in an aquarium?
Adequate space is required as they are small but active fish and benefit from a well-sized tank.

Sophie Rampling –
These fish are vibrant and peaceful. I kept them in a 10-gallon planted tank with other community fish. They adapted quickly and stayed active without causing any stress to the other inhabitants. Water temperature stayed below 80°F, and they looked great throughout the season.
Simon Bell –
The colors are striking, especially in a well-lit tank. They don’t compete for space and coexist well with shrimp and small tetras. I’ve had them for three months and they’re still healthy and lively.
William Brown –
Great addition to a community tank. They’re hardy and don’t require constant attention. I noticed they prefer cooler water, so I adjusted the heater settings and now they’re thriving.