Max Size: 2.5cm

Ruby Tetra (Axelrodia riesei)

The Ruby Tetra is a beautiful, small fish that has a Peaceful disposition with other fish and invertebrates. They are very active and are an excellent addition to both nano and planted aquariums. However, they are not suitable for the community aquarium because of their small size and may feel intimidated and be outcompeted for food. Also, this Tetra is a delicate species and requires specific conditions to live in and is quite needy. It is comparatively more challenging to look after than most Tetras.

The Ruby Tetra has an all-over intense red body colouration, transparent fins and a black splotch at the end of its tail.


Ruby Tetras
Ruby Tetras
Ruby Tetras
Ruby Tetra
Ruby Tetra
Ruby Tetra
Quick Facts
Scientific NameAxelrodia riesei
Other NamesNone
Aquarium LevelMiddle - Top
Best kept asGroups 8+
Lifespan5 - 10 years
Water Parameters
Water TypeFreshwater
PH4.5 - 6.5
GH3 - 12
TDS18 - 90
68 - 82℉
20 - 27.8℃

Natural Habitat



In the home aquarium, the Ruby Tetra will readily accept most good quality dried foods such as granules, flakes and sinking pellets. These modern food products have been developed to provide all adequate nutrition to maintain your fish's health and dietary requirements.

Providing additional foodstuffs such as live, frozen, and freeze-dried meals such as bloodworm, daphnia, and tubifex once or twice a week will provide additional benefits to your fish's health and well-being but is not a must for this fish.

It should be noted that bloodworms should only be given as an occasional treat and should not be used as the staple diet as they are difficult for fish to digest and can potentially cause blockages.

This fish is an omnivore in the wild, meaning it will consume some vegetable matter. Although most modern fish foods take this into account and include them in their products, you can still supplement your fish's diet with blanched vegetables such as spinach, broccoli, and zucchini. Ensure you do not overfeed your fish and remove any leftovers the following day.

Tank Mates

1 interesting tank mate ideas for the Ruby Tetra could include:

Staeck Endler(Poecilia wingei)

Sexual Dimorphism

It is relatively easy to differentiate between males and Ruby Tetras. Adult males are more intensely-coloured and slightly smaller than females. Sexually mature females, like most tetras, also develop rounder-bodied than males.

Other Tetras of interest

African Moon Tetra(Bathyaethiops caudomaculatus)
African Red Eyed Tetra(Arnoldichthys spilopterus)
Arowana Tetra(Gnathocharax steindachneri)
Black Darter Tetra(Poecilocharax weitzmani)
Black Line Tetra(Hyphessobrycon scholzei)
Black Neon Tetra(Hyphessobrycon herbertaxelrodi)
View all Tetras
Date Added: 21/09/2020 - Updated: 10/08/2022 15:18:16