Ruby Tetra (Axelrodia riesei)
Axelrodia riesei is a diminutive tetra from Colombia. These tiny schoolers don’t even reach an inch in length and are thus among the smallest of all tetras. Their reddish-orange colouration is accentuated with blackwater conditions and high-quality foods. They pair well with other true nano fishes, and also make good dithers for small dwarf cichlids.
These are wild-caught adults around X inches long, highly prized for intense red colouration that simply cannot be achieved with captive bred specimens.
Specifications
| Species | Axelrodia riesei |
|---|---|
| Origin | Colombia |
| Size | Up to X inches |
| Coloration | Reddish-orange, enhanced in blackwater conditions |
| Compatibility | Best with nano fish species and small dwarf cichlids |
FAQ
Are Ruby Tetras suitable for beginners?
Ruby Tetras are well-suited for beginner aquarists due to their small size and peaceful nature, but they require stable water conditions and a well-maintained tank environment.
What kind of water conditions do Ruby Tetras prefer?
Ruby Tetras thrive in soft, slightly acidic water with a pH between 5.5 and 6.5 and a temperature range of 72–78°F (22–26°C). Blackwater conditions enhance their coloration.
Can Ruby Tetras be kept with other fish?
Yes, they pair well with other small, peaceful fish such as dwarf cichlids and other nano tetras. Avoid aggressive or large fish species.

Dan Kerr –
The Ruby Tetras arrived healthy and vibrant. Their red color really stands out in the tank. I’ve kept them with dwarf cichlids and they get along well. Easy to maintain and very active in a small community setup.
Penelope Manning –
These fish are small but lively. The red coloration is impressive, especially after a few weeks in blackwater setup. I noticed a difference in their appearance compared to captive-bred ones. Slightly more active than expected.
Adam Greene –
Great addition to a nano tank. They school well and don’t stress other fish. The color is intense and natural. I’ve kept them for over three months and they remain healthy and active.