Keep Your Blue Tetra Happy and Healthy with These Tips

If you’re looking for a stunning and vibrant addition to your home aquarium, the Blue Tetra might be just what you need!

These small and attractive fish can brighten up your tank, but taking care of them can be quite tricky. Whether you’re a seasoned aquarium keeper or a new enthusiast, understanding everything about the blue tetra, from their food habits to their tank requirements, is incredibly essential.

In this guide, we’ll cover everything you need to know to keep your Blue Tetras healthy, happy, and swimming beautifully in your aquarium. From Blue Tetra facts to how to creating optimal tank conditions, we’ve got you covered. Read on and discover all the tips and tricks to keep your Blue Tetra thriving in your tank.

Blue Tetra Facts & Overview

Blue Tetra are small freshwater fish that are popular for their bright blue coloring. These active and playful fish love to swim around in groups, so it is best to keep them in groups of six or more. They are omnivorous, meaning that they will eat both plant and animal material, and require a balanced diet to maintain good health.

It is vital to provide plenty of swimming space and hiding places to keep your blue tetra comfortable. Blue tetras are easy to keep, and they require very little care aside from feeding them a balanced diet. They thrive in a well-kept aquarium with a consistent water temperature. An aquarium heater is necessary to maintain the proper water conditions. With appropriate care and attention, blue tetras can live for up to five years.


The Blue Tetra is a small and colorful fish that originates from Peru. It is naturally found in the Amazon Basin, specifically in Colombia, Brazil, and Peru. Interestingly, the species was initially mistaken for another species, Boehlkea fredcochui, until it was correctly identified in 2008.

The Blue Tetra is native to Iquitos, a city located in northeastern Peru. In honor of the German aquarist, Dieter Bork, the species was named Knodus borki. Knowing these facts about the Blue Tetra’s origin can help in creating an appropriate living environment for the fish, as it allows you to better understand their natural habitat and behavior.


Blue Tetra are a popular freshwater aquarium fish known for their vibrant blue coloration. While they are generally hardy and easy to care for, they can be affected by Neon tetra disease, caused by mycobacteria. This disease is highly contagious and there is no known cure. The best treatment for Neon Tetra disease is to separate the affected fish to prevent other fish from getting infected.

In terms of diet, Cochu’s Blue Tetra thrive on a varied diet of meaty foods such as brine shrimp, bloodworms, and daphnia. Additionally, when breeding Blue Tetra, it’s important to maintain slightly acidic water conditions for better hatch rates of the eggs. By following these tips, you can ensure that your Blue Tetra remain happy and healthy in their aquarium environment.

Adult Size & Lifespan

Blue tetras are a popular and colorful addition to many aquariums. Adult blue tetras typically reach a size of two inches in length, with both male and female tetras having similar sizes. However, female blue tetras may appear larger due to their rounder shape.

When properly cared for, blue tetras can live for an average of 3 to 4 years in captivity. In the wild, they may live up to 6 years. It’s important to note that blue tetra eggs require slightly acidic conditions for better hatch rates.

Overall, understanding the facts and overview of blue tetras can help aquarium owners provide the proper care and environment to keep their blue tetras happy and healthy.


The Blue Tetra (Boehlkea fredcochui) is a freshwater fish native to Peru. While it is not as widely available in the U.S. as in some other parts of the world, it can be purchased online in the form of live fish shipping. The cost of Blue Tetras can vary depending on the zone they are being shipped to.

One important consideration when keeping Blue Tetras is their tendency to nip the fins of other fish. Keeping them in groups may help to reduce this behavior. By providing a suitable environment and a balanced diet, you can help to ensure that your Blue Tetras live happy and healthy lives in your aquarium.

Diet and Feeding

The Blue Tetra (Paracheirodon simulans) is a popular freshwater fish species that is known for its vibrant blue color and active, social behavior. When it comes to diet and feeding, Blue Tetras are omnivores, meaning they eat both animal and plant material. To keep your Blue Tetra happy and healthy, it is recommended to feed them a varied diet of high-quality flake food, pellets, and frozen or freeze-dried tubifex and bloodworms.

Other recommended foods for Blue Tetra include freeze-dried or frozen brine shrimp, bloodworms, spirulina flakes, algae wafers, and blanched vegetables such as spinach, zucchini, and peas. Ensuring a balanced and varied diet for your Blue Tetra can help promote optimal health and longevity.

Behaviour and Compatibility

The Blue Tetra fish is a peaceful species that can be kept in community tanks with other fish species, but caution should be exercised. It is best to keep them in small groups of at least six individuals to prevent any aggressive behavior.

Blue Tetras are considered to be an easy care level fish, but they may exhibit fin nipping behavior if kept in small aquariums or insufficient numbers.

These fish originate from the Amazon Basin in South America, and they prefer water temperatures between 22-26°C (71.6-78.8°F). As omnivores, they feed on both meaty and plant-based foods. Understanding the behavior and compatibility of Blue Tetras is important when creating a home aquarium for them, and providing a suitable environment can help keep them happy and healthy.

Sexual Dimorphism

Blue Tetras are small, freshwater fish that are popular among fish enthusiasts due to their vibrant blue coloration. These fish exhibit sexual dimorphism, with males being typically narrower and bolder in color, while females tend to be plumper and duller in color.

Males are usually more streamlined in body shape and more intensely colored than females, while females tend to be more expansive and less streamlined than their male counterparts. During mating, males display stronger coloration than females.

On average, Blue Tetras are between 3.75 to 4.25 centimeters in size or 1.5 to 1.67 inches. Understanding sexual dimorphism in Blue Tetras is important for keeping these fish happy and healthy in the aquarium, as it can help you distinguish between males and females and ensure that they have appropriate mating conditions.

blue tetra appearance

Appearance & Behavior

Blue tetras are predominantly bluish-green in color with hints of pink and green and a reflective sheen that adds to their beauty. Males are smaller in size compared to females but show stronger coloration or flashy blue stripes, especially during mating. On average, these fish grow to 1.5 to 1.67 inches or 3.75 to 4.25 centimeters.

Blue tetras are active swimmers and need plenty of space to swim, unlike other fish their size. Due to their active nature, it is recommended to keep them in groups of at least six to ensure that they are happy and well-adjusted.

However, like any other fish, they are susceptible to disease, including neon tetra disease. If affected, blue tetras tend to become restless and lose their color. Hence, owners need to be aware of their appearance and behavior to ensure their health and happiness.

Colors, Patterns, Fins, and Sex Differences

When it comes to appearance and behavior, the Blue Tetra is an eye-catching fish with its overall electric-blue color against dark blue with a longitudinal stripe running along the dorsal surface, extending to the middle and caudal fins.

Depending on the refraction of surrounding light, the Blue Tetra can appear blue, bluish-green, or steely blue. Additionally, the fish’s irises are shiny silver in color with a slightly golden shade at the upper portion of the eye and a brownish-red shade at the bottom border.

In terms of sex differences, females have round bellies while males are straight and lean. Males develop an intense red color around their anal fin during spawning season. It’s important to consider all of these physical characteristics when caring for a Blue Tetra to ensure it remains happy and healthy.

Typical Behavior

Blue tetras are naturally shoaling fish and therefore require a group of at least 6 individuals for optimal health and well-being. They have distinct differences in appearance between males and females, which include male blue tetras being more vibrantly colored and narrower, and females being plumper and duller in comparison. These fish have an overall silver-clear body, with blueish hues concentrated around the posterior end.

Their behavior can also be affected by their environment, causing them to appear more washed out or even become aggressive towards other tankmates when they are uncomfortable. To keep your blue tetra happy and healthy, it is important to keep them in a comfortable environment and maintain a group of at least 6 individuals.

blue tetra carre

Blue Tetra Care & Tank Requirements

Blue tetras are a popular freshwater fish with a scientific name of Boehlkea fredcochui and a common name of Cochu’s Blue Tetra. These fish have vibrant blue and silver colors and are active swimmers. When it comes to caring for blue tetras, their care level is considered easy.

It’s recommended that their tank has a pH of 6 – 8, dH range of 5 – 12, and temperature of 73°F – 82°F (23°C – 28°C). Blue tetras need a minimum tank size of 20 gallons and should have enough plants and decorations to ensure that they are shaded and the aquarium water is oxygenated, but not too many as to overcrowd the fish. By providing the ideal tank requirements, you can help keep your blue tetra happy and healthy.

Habitat and Tank Requirements

The Blue Tetra is a native species of South America, found predominantly in the Amazon River basins. To ensure their happiness and health in an aquarium setting, it is important to pay attention to their appearance and behavior, specifically in regard to their habitat and tank requirements.

The optimal water parameters for Blue Tetra in an aquarium setting include a pH range of 6-8 and a dH range of 5-12. The ideal temperature range is between 73°F to 82°F (23°C to 28°C). Blue Tetra should be kept in appropriately sized aquariums and in large enough schools to prevent fin-nipping.

It’s crucial to provide Blue Tetra with a proper and comfortable space, especially for their preferred water temperature range of 22-27.5℃ (72-82℉) and pH range of 6.0-8.0. By following these habitat and tank requirements, you will ensure that your Blue Tetra will thrive and live a happy and healthy life.

Tank Conditions

To keep your blue tetras happy and healthy, it’s important to pay attention to both their appearance and behavior. These fish require a tank of at least 20 gallons with just enough plants and decorations to provide shade and oxygenation. Ideal tank conditions for blue tetras include a pH between 6 and 8, dH between 5 and 12, and a temperature between 73°F and 82°F (23°C – 28°C).

To ensure that your blue tetras thrive, it’s important to keep the aquarium water at the right temperature, oxygenated, and supply them with the right food. You should also make sure that the tank is kept clean and provide plenty of open space for the fish to swim. Water hardness should be between 5° and 12° dH. With these considerations in mind, you can help your blue tetras live a healthy and happy life in their new environment.

Tank Mates

The appearance and behavior of blue tetras make them a great addition to any community tank. When it comes to tank mates, blue tetras are compatible with several other species of small tetras, including Neon Tetras, Ember Tetras, Diamond Tetras, Red-Eye Tetras, and Von Rio tetras. They also get along with Corydoras, Rasboras, Mollies, Rainbow Fish, and Platies.

It’s important to note that blue tetras should be housed with non-aggressive fish of the same size and speed to avoid any bullying or stress. Additionally, blue tetras are known to be fin-nippers and should not be housed with fish that have long, thin fins. By carefully selecting tank mates, you can ensure that your blue tetra is happy and healthy in their environment.

Tank Size

To keep your blue tetra happy and healthy, it’s important to consider their appearance and behavior when setting up their environment.

One factor to consider is tank size. Blue tetras need a tank with at least 25 gallons of water for a school of more than six, while a larger tank of 50 gallons is ideal for keeping blue tetras. For a single blue tetra, a tank of 20 gallons or more is recommended. Keeping blue tetras in tanks that are too small can result in fin nipping.

In addition to tank size, it’s important to ensure that the tank contains enough plants and decorations to oxygenate and shade the tank but not overcrowd the fish. An appropriate environment will not only keep your blue tetras healthy and happy, but it will also enhance their vibrant and stunning appearance in the tank.

blue tetra conclusion

Are Blue Tetras Similar to Rosy Barbs in Terms of Care and Maintenance?

When it comes to the care and maintenance of aquarium fish, many enthusiasts wonder about the similarities between blue tetras and rosy barbs. While these species require similar water parameters and diets, there are certain secrets of the rosy barb that could prove beneficial for blue tetra owners. By understanding the unique needs and behaviors of rosy barbs, aquarists can provide optimal care for their blue tetras and ensure a harmonious aquarium environment.


Taking good care of your blue tetra is not only important for their overall health but also helps ensure that they remain happy and vibrant for years to come. Understanding their behavior, feeding, and habitat requirements is crucial to maintaining their well-being. With the right care regime and tank set up, you can provide a safe and healthy environment to help your tetra thrive. From diet to tank conditions, our comprehensive guide covers it all. So, if you’re looking to keep your blue tetra healthy and happy, read our guide today!

Hi, I'm Millie a passionate fish enthusiast and blogger. I loves learning about all kinds of aquatic creatures, from tropical fish to stingrays.

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