Tetra are a really popular aquarium fish and there are loads of tetra that would be very happy in an Avo – here’s the Noux guide to the not so humble tetra.

There are over 700 different types of tetra and they vary in size from the tiny Ember tetra (great for an Avo aquarium), to really big ones such as the Pacu that can grow up to 60cm is size. Most tetras like to be kept in schools, with some types being the perfect peaceful tank companion to others being more aggressive and unsuitable for community tanks.

What makes a tetra a tetra?

Tetra originate from Africa, Central America and South America, and are part of the biological family Caracidae. Tetra is short for Tetragonopterus, which translates from Greek meaning four sided wing, as tetras have four unpaired fins. Tetras have a small fin between the dorsal and caudal fins, known as the adipose fin. Many popular tetras have brightly coloured caudal fins. Tetras also have a long anal fin. Their four unpaired fins being the caudal fin, anal fin, dorsal fin and adipose fin.


Tetras are a very popular aquarium fish and because of this some fish have common name of tetra despite not being tetras at all, for example the vampire tetra isn’t part of the Caracidae family but actually in the Cynodontidae family – we definitely do not recommend a vampire tetra as a pet for in Avo, these can grow up to 1m long and have vampire like fangs for impaling other fish!

Most tetras love a planted environment as it gives them lots of hiding places and the plants help to oxygenate the water. However be aware that some types of tetra (such as silver dollars) are partial to a quick nibble and may make short work of your greenery, so if you don’t want to be replacing your plants all the time these are best avoided.

Our top 10 tetras:

There are hundreds of tetras in all shapes and sizes, but we’ve listed below our top 10 tetra fish, all peaceful community fish that will happily live in groups of 4-6 in an Avo aquarium, without destroying your plants.

1. Black neon tetra


http://oceanadesigns.net/wp-json/oembed/1.0/embed?url=http://oceanadesigns.net/edges/ Colour: Black neon tetras are one of the less colourful tetras as they are mainly silver with a black and white long stripe. However they look fantasic against a dark substrate and green plants.

go here Maximum size: 4cm

follow link School size: 4-6


2. Kitty tetra


Colour: Golden grey with red and blue eyes.

Maximum size: 3cm

School size: 4-6


3. Bentos tetra


Colour: Silvery pink, a black dortal fin with a white tip

Maximum size: 4cm

School size: 4-6


4. Ember tetra


Colour: Bright orange or reddish with some translucency near the pelvic fin. Eyes are often the same orangey red colour outlined in black.

Maximum size: 2cm

School size: 4-8


5. Rumny nose tetra


Colour: Silvery body with a deep red head colour, five black stripes on the tail.

Maximum size: 5cm

School size: 4


6. Green neon tetra


Colour: The green neon tetra is similar in appearance to the closely related and better-known neon tetra, but it is slightly smaller, and its red patch is less pronounced and the blue-green areas of the upper body are more brilliant.

Maximum size: 3.5 cm

School size: 4-6


7. Bloodfin tetra


Colour: Silver-green body with red fins.

Maximum size: 3.5cm

School size: 4-6


8. Glowlight tetra


Colour: Silver with a bright iridescent orange to red stripe from the nose to the base of its tail

Maximum size: 3.5cm

School size: 4-6


9. Black phantom tetra


Colour: Light grey with a black patch, surrounded by iridescent silver edging, the male’s fins are black.

Maximum size: 4cm

School size: 4-6


10. Lemon tetra


Colour: Translucent yellow, with a pearlescent shine and black on the fins.

Maximum size: 4cm

School size: 4-6


Setting up the perfect Avo for tetras:



When setting up and Avo for tetras there are a few things you should do to make the Avo the perfect home for your fish.

– Groups are better. A school of 4-6 tetras is idea in Avo.

– Use a dark fine substrate. This makes the tetras happier as it mimics their natural environment, the fine grains means that the plants can root down well, black or dark sand make the perfect substrate.

– Lots of plants. The tetras listed in our top 10 all love a planted tank, it gives the places to hide and swim in and out of. They will be more active and confident. Plant taller plants at the back and medium plants around the sides to create an attractive display.

– Leave room at the front. Plant shorter carpeting plants at the front. This leaves an open area for the tetras to swim in.

Did you know?

That the Piranha is technically classified as a tetra – definitely not a recommended fish for Avo!