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. Suitable for both nano and planted aquariums, these Tetras are very active. Their small size, however, makes them unsuitable for community aquariums because they may feel intimidated and outcompeted. 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 intense red colouration on the top half of its body, and the bottom half is transparent. These fish also have translucent 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
Year Described1966
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

Adonis Tetra(Lepidarchus adonis)
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)
View all Tetras
Date Added: 21/09/2020 - Updated: 06/12/2022 13:48:00