New Guinea Rainbow – Medium
Also known as the Red Rainbow. Large males get up to 5 inches in length and develop a very deep body with brilliant red color. Females slightly smaller and not as deep bodied but retain a brilliant silver/gold shimmering color.
| Scientific Name | Glossolepis incisis |
|---|---|
| Family | Melanotaeniidae |
| Origin | New Guinea; Lake Sentani |
| 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 size difference between male and female New Guinea Rainbows?
Male New Guinea Rainbows can grow up to 5 inches and have a deep body with bright red color. Females are slightly smaller and less deep-bodied, but still display a brilliant silver/gold shimmering color.
Can New Guinea Rainbows live in a planted aquarium?
Yes, they are compatible with planted aquariums and thrive in such environments with good filtration and adequate space.
What water temperature do New Guinea Rainbows prefer?
They prefer water temperatures below 84°F. They handle lower temperatures better than most tropical fish.

Lucas Watson –
Bought this for my planted tank and the fish have adapted well. The male has developed a deep red body and looks stunning. Water temperature stays below 80°F, and they seem very active and healthy.
Jan Ross –
The fish are easy to care for and fit well in a planted setup. The female has a beautiful silver-gold sheen. I keep the tank temperature stable and they haven’t shown any signs of stress.
Felicity Newman –
Great addition to my aquarium. The red color of the male stands out, and the fish are peaceful and don’t compete with other species. I’ve had them for three months and they’re thriving.