Tetras are amongst the most popular aquarium fishes. There are probably more than 150 distinct species of tetra from which the aquarist may choose and this includes a large number of visually stunning fishes that are bound to enhance any home aquarium.
Is the Columbian Tetra a good community fish? The Columbian Tetra should be considered to be an excellent community fish and gets on with most species if kept as a small shoal. It prefers soft, slightly acidic water chemistry. The female is distinguishable by being slightly fuller in the body than the male.
|Common name(s)||Columbian Tetra – also known as:|
Blue Columbian Tetra
Blue-red Columbian Tetra
Red-blue Columbian Tetra
|Scientific name||Hyphessobrycon colombianus|
|Originate from||Acandi River near Acandí in northwestern Colombia in South America|
|Care required||Easy to care for and popular|
|Temperament||Placid, shoaling fish if kept as a shoal of 10 or more|
|Colour & Form||Silver-grey body, turquise to blue scales above spine, deepening towards dorsal fin, red fins – anal fin outlined in black|
|Lifespan||Up to 5 years|
|Adult size||Up to 2.6 inches|
|Diet||Omnivorous – eat aquatic insect larvae in nature|
|Aquarium size||36 inches in length or greater|
|Compatible with||Most other Tetras, Barbs, Danios, Guppies and other livebearers, dwarf cichlids, smaller Gouramis, catfish and loaches|
|Avoid keeping with||Large and/or aggressive species|
|Breeding||Easy if you put the fish in the right environment.|
|Water temp||71 – 83 Fahrenheit|
|Water pH||6.5 to 7.0|
|Water hardness (dGH or dH)||Up to 15 dGH|
Origins of the Columbian Tetra
Tetras, as a “family” of fishes belonging to the biological family Characidae are found in nature in Africa, Central America and South America.
The Columbian Tetra native to the Acandi River near Acandí in northwestern Colombia in South America. The vast majority of Columbian Tetras available to aquarists are captive-bred and were only really introduced in 2002, or thereabouts.
Characteristics of the Columbian Tetra
As you can see, the Columbian Tetra is characterized by its high body, its pale, silver-grey body and red finnage. Above the spine the scales reflect an increasingly blue tinge which deepens, the closer it gets to the dorsal area. It will grow to up to 2.6 inches in the aquarium and live for up to five years. The Columbian Tetra is also known as:
- Blue Columbian Tetra
- Blue Tetra
- Blue-red Columbian Tetra
- Red-blue Columbian Tetra
- Red-finned Tetra
- Red Tetra
The Columbian Tetra is a very adaptable little fish because it can tolerate both clear, almost neutral water and “blackwater” which is quite acidic.
The Columbian Tetra is a shoaling fish and should be kept as a group of at least six fish, though a shoal of, say, ten or more fish is highly recommended, as it is known to bully smaller fish if it is not part of a larger shoal.
Having plenty of vegetation to break up lines of sight will also help to protect your Columbian Tetras from predation but it is obviously advised that Columbian Tetras are not kept with predatory species.
The fins are a deeper red when the fish are active and tend to become paler when the fish are resting. The anal fin has a distinctive black line along the outer edge.
The Columbian Tetra has a deeper body than, for example, a Neon Tetra and the female has a marginally rounder body than the male, especially when gravid (carrying eggs). The colouring of the male tends to be fuller and richer than that of the female, especially as spawning approaches.
The Columbian Tetra tends to inhabit the middle area of the aquarium (top to bottom). That said, it is a vigorous fish when breeding and will readily traverse the entire aquarium.
The Columbian Tetra is, by nature, a shoaling fish and it is generally recommended to purchase six or more fish, as their nature is to swim together as a shoal and they will tend to thrive much better as a shoal. Columbian Tetras are excellent community fish and are ideal for novice aquarists, as they don’t tend to have aggressive tendencies towards other species unless they are not kept as a shoal (ten or more fish are recommended). It is advised not to include Columbian Tetras in an aquarium containing predatory species, as their wellbeing may rapidly deteriorate.
Columbian Tetras, like most rainforest species, prefer a shaded tank, as they can hide from predation, so consider including floating leaves and/or allowing vegetation to grow so that it floats on the surface of the water to provide shade. They are used to habitats that include decomposing wood and vegetation, which tends to make the water brown (the effects of tannins) and acidic but seem equally happy in clear water.
It is generally advised that the minimum tank size for Columbian Tetras should be one of 36 inches in length or more due to the shoaling nature of the species, which will enable a small shoal to move around freely. The tank should be well-planted but with clear areas where the fish can swim freely. The water should have gentle movement.
Columbian Tetras prefer fairly neutral water with a pH of 6.5 to 7.0 with a temperature range between 71 and 83 degrees Fahrenheit and up to 15 dGH.
The general rule for Tetras is that by keeping six or more of the same species in an aquarium they will be fully aware of which is male and which is female and they will act accordingly.
Most (but not all) Tetras have an additional fin which identifies them as being Tetras and the Columbian Tetra is no exception. If you look between the dorsal fin and the caudal (tail) fin of the Columbian Tetra you will observe a tiny, additional fin, known as the adipose fin. The purpose of this fin is not fully understood but, if it is present on a freshwater tropical fish then you can be pretty certain that the fish is a Tetra.
Tetra comes from the Greek word “Tetragonopterus” which means square-finned and appears to relate to the four fins on vertical plane of the fish (dorsal, adipose, caudal and anal fins) which span the central line of the fish (when viewed from above or below, front or rear) and are not present as a pair (e.g. the pectoral or pelvic fins).
Columbian Tetra – Video
How do Columbian Tetras breed?
Tetras, in general, will scatter eggs by laying them over fine plants such as Cabomba, Fontanalis or Java Moss.
Columbian Tetras, like most species, are noted to leap above the water surface during breeding and in general, so it is advised that the tank should be covered to mitigate the risk of losing fish.
As the female Columbian Tetra becomes ripe with eggs, the difference between the sexes becomes even more evident. If you plan to attempt to breed Columbian Tetras then it is recommended that you have a breeding tank prepared. Such a tank can be empty but you may wish to include a mesh or grid under which the fertilized eggs will fall and/or a sterilized breeding mop.
That said, Columbian Tetras will breed in a community tank and, if the tank is well planted, it is likely that at least a few fry may survive to reach adulthood. Having a good covering of Willow Moss on the floor of the aquarium seems to provide a safe haven for fry, which can help them to survive predation in a community or single-species tank.
Some say that a novice may find it difficult to breed Columbian Tetras but, in my experience, by understanding the conditions that are ideal for breeding, most species will breed quite readily, as it is natural for them so to do and, in general, nature finds a way.
I have observed Columbian Tetras breeding readily and vigorously in quite neutral water but soft, slightly acidic water is the general recommendation
The female will swim vigorously around the tank and, if you include two males then they will encourage her to lay her eggs by bumping into her. She will lay her slightly adhesive eggs which will immediately be fertilized by the male(s) and will either stick to plants or spawning mop or will fall to the bottom of the tank (preferably through the mesh or trap). Once spawning is complete, remove the adults, as they are likely to consume the eggs, given the chance, and take no further parental responsibility.
Spawning usually takes place in the early morning. In nature, Columbian Tetras spawn at the start of the rainy season.
Breeding tank for Columbian Tetras
You should prepare a tank of around 20 gallons in size with mature water. The water should be at a pH of around 6.0 to 6.8, a dGH of 18 and, ideally around 78 degrees Fahrenheit with a low level of light.
You may wish to introduce mosquito larvae or bloodworm as an inducement to reproduction.
The female will swim amongst the plants, laying her eggs whilst the male will swim alongside or behind her and fertilize the eggs as they are laid. Typically, when the female lays her eggs during a spawning, they may adhere to plants or will sink to the bottom of the tank.
Once the female has scattered her eggs and the male has fertilized at least some of them then the adults should be removed carefully from the breeding tank because they will have nothing more to do with the eggs but they may simply eat them.
Keep the lights off and the tank dark because Tetra eggs and fry are particularly sensitive to the light.
The eggs will hatch typically in a day or so depending on tank temperature and conditions and the fry will become free-swimming after around three to four days after hatching. Keep the tank unlit for the first week or so then gradually increase the lighting.
The newly hatched fry will firstly feed on their yolk sac but, once free-swimming, can be fed infusoria (particularly rotifers) and will also thrive on egg yolk during the first two to four weeks. It is worth mentioning that immediately after hatching, fry seem quite vigorous but will soon go into a resting state before they become free-swimming so please don’t mistake this initial stage as being free-swimming.
After around four days or so add baby brine shrimp. Once the fry are sufficient in size not to be treated as a snack then they can be introduced into the community tank where they will join the existing shoal. Before moving the adolescent fish into the community tank ensure that you have balanced the water temperatures to mitigate the risk of White Spot or other diseases being triggered.
Should your Columbian Tetras have a special diet for breeding?
Adult Columbian Tetras don’t need any particular inducement to breed. That said, it has been suggested that adding mosquito larva may encourage them, presumably because the addition of a new food may “fool” the fish into thinking that it is breeding time. From my own experience, I would always recommend keeping all of your fish in the best possible condition at all times, as this is good for the wellbeing of your fish.