cochus blue tetra

Discover Fun with Cochus Blue Tetra – Your Ideal Pet Fish!

Are you looking for a colorful and lively addition to your home aquarium? Look no further than the cochus blue tetra! This small freshwater fish is known for its vibrant blue coloration and active personality, making it a popular choice among aquarium enthusiasts.

Whether you’re an experienced fish owner or just starting out, the cochus blue tetra is an ideal pet fish for all skill levels. They are easy to care for, and their lively nature is sure to bring joy and excitement to your home.

In this article, we’ll introduce you to the world of the cochus blue tetra, from their origins and physical characteristics to their ideal tank setup and feeding habits. We’ll also cover breeding and reproduction, common health concerns, and how to create a visually appealing and stimulating environment for your fish.

Key Takeaways:

  • The cochus blue tetra is a colorful and active freshwater fish ideal for all skill levels of aquarium enthusiasts.
  • Their vibrant blue coloration and lively nature make them a popular choice for home aquariums.
  • Throughout this article, we’ll cover everything from their physical characteristics and ideal tank setup to feeding habits and common health concerns.

Cochus Blue Tetra Overview

Attribute Details
Scientific Name Boehlkea fredcochui
Common Name Cochu’s Blue Tetra, Blue King Tetra
Origin South America, particularly in Colombia and Peru
Size Up to 2 inches (5 cm)
Life Expectancy 3-5 years
Different Colors Iridescent blue body with red fins
Diet Omnivore; accepts most foods, prefers live and frozen
Temperament Peaceful, somewhat shy
Tank Size Minimum 20 gallons for a small school
Temperature 72-79°F (22-26°C)
pH 5.5-7.0
Water Hardness Level Soft to medium
Care Level Easy to moderate
Breeding Style Egg scatterer
Compatible Fish Peaceful small to medium-sized fish
Type of Tank Most Suitable Planted aquarium with hiding spots
Tank Mates Small tetras, rasboras, peaceful barbs, and dwarf cichlids

Getting to Know the Cochus Blue Tetra

As a freshwater fish enthusiast, I am always on the lookout for colorful and fascinating fish species to add to my collection. One standout favorite of mine is the cochus blue tetra, also known as the blue tetra fish or cochus fish.

Originating from the Amazon Basin in South America, this tetra fish species is known for its striking blue and silver coloration, small size, and peaceful temperament.

The cochus blue tetra typically grows up to 1.5 inches in length, making it an ideal choice for smaller aquariums. It is also a schooling fish, so it is recommended to keep them in groups of at least six.

One of the unique characteristics of the cochus blue tetra is its ability to change its coloration based on its mood and environment. When excited or during breeding, the blue on its body intensifies, making it an even more visually stunning addition to your aquarium.

Common Name Cochus Blue Tetra
Scientific Name Boehlkea fredcochui
Family Characidae
Size 1.2-1.5 inches
Temperament Peaceful and social
Diet Small live or frozen foods, as well as flakes and pellets
Water Parameters Temperature: 72-82°F, pH: 6.0-7.5, Hardness: 5-15 dGH


Creating the Perfect Home for Your Cochus Blue Tetra

As aquarium fish, small tropical fish like the cochus blue tetra require a carefully designed habitat to thrive. Here are some key considerations when creating the perfect home for your fish:

Tank Size

When selecting an aquarium, keep in mind that even though the cochus blue tetra is small, it still needs enough space to swim and explore. A 10-gallon tank is a good starting point for a small school of these fish.

Water Conditions

The quality of the water in your tank is vital to the health of your cochus blue tetra. Aim to maintain a consistent water temperature between 72-78°F. Keep the pH level between 6-8 and ensure the water hardness is between 4-8 dGH.

Decor and Plants

The cochus blue tetra loves a well-decorated tank. Add rocks, driftwood, and live plants to create an inviting environment for your fish to explore. Plants like Java moss and Anubias are great options that can also help oxygenate the water.


A good filtration system is essential to maintain a healthy environment for your fish. Make sure to choose a filter that is appropriately sized for your tank and can handle the bioload of your fish. A filter that can provide both mechanical and biological filtration is best.

Tank Mates

Cochus blue tetras are social fish that enjoy the company of their own kind. Keeping a school of four to six tetras is recommended. Be cautious when selecting tank mates, as some fish may be too aggressive or too large to coexist with the cochus blue tetra.

By following these tips, you can ensure that your cochus blue tetra has a comfortable and healthy environment to thrive in.

Feeding Your Cochus Blue Tetra


cochus blue tetra fish

By Il le faut – Own work, CC BY-SA 3.0,

Feeding your cochus blue tetra is an essential part of ensuring its health and wellbeing. As with most small tropical fish species, it is essential to provide them with a varied and balanced diet.

The cochus blue tetra is an omnivore and will eat both plant and animal matter. In the wild, their diet consists of small insects, small crustaceans, and algae. To replicate this diet in your aquarium, you will need to provide a mix of live, frozen, and dried foods.

Some of the best foods to feed your cochus blue tetra include:

  • High-quality flake food – this should form the basis of their diet and should be supplemented with other foods
  • Small live or frozen foods – such as brine shrimp, daphnia, or bloodworms
  • Vegetables – such as blanched spinach or zucchini

It is important to note that overfeeding your fish can lead to health problems and a dirty aquarium. Feed your cochus blue tetra small amounts, 2-3 times a day, rather than one large feeding. This will help to prevent overfeeding and keep their tank clean.

When feeding your cochus blue tetra, observe their behavior. If they are not eating or are lethargic, it may be a sign of illness or stress. Adjust their diet and water conditions accordingly, or consult a veterinarian if the problem persists.

Breeding and Reproduction

As mentioned earlier, the cochus blue tetra is a peaceful and social fish that enjoys the company of its own kind. Breeding them can be a rewarding experience, provided you have the right setup and knowledge.

First, you’ll need a breeding tank with a minimum size of 10 gallons. The water temperature should be around 78 to 82 degrees Fahrenheit, with a pH level between 6.0 and 6.8. Make sure to provide plenty of hiding places, such as plants or breeding cones, to give the mating pair privacy.

When the males and females are ready to mate, they will perform a courtship dance. The male will chase the female around the breeding tank, and if she’s receptive, they will spawn together. The eggs will stick to the breeding cone or plants, and the parents will guard them fiercely until they hatch in about 24 to 36 hours.

Tip: Remove the adult fish after spawning to prevent them from eating the fry.

Once the fry hatch, they will feed on their yolk sacs for 2 to 3 days. After that, you can feed them infusoria or newly hatched brine shrimp. As they grow, you can gradually introduce them to finely crushed flakes and pellets.

It’s essential to keep the water quality and temperature stable during the fry’s first weeks of life. Perform partial water changes regularly and monitor the water parameters daily.

Overall, breeding cochus blue tetras can be a fun and exciting adventure. With patience and dedication, you can watch your fish grow and thrive, and maybe even start your own community of these charming tetras.

Common Health Concerns

As with any aquarium fish, it’s important to monitor the health of your cochus blue tetra regularly. While these fish are generally hardy and easy to care for, there are some common health concerns to watch out for.

One of the most common issues is fin rot, which is caused by bacterial infection. Symptoms include ragged or frayed fins, discoloration, and lethargy. To prevent fin rot, ensure that your tank is properly cycled and maintain good water quality. If your fish show signs of fin rot, perform a partial water change and treat the tank with an antibacterial medication.

Another possible problem is ich, a parasitic infection that affects many freshwater fish. Symptoms include white spots on the fish’s skin and fins, along with flashing (scratching against objects in the tank). To prevent ich, maintain good water quality and avoid overcrowding. If your fish do contract ich, treat the tank with an anti-parasitic medication.

Other potential health concerns for cochus blue tetras include swim bladder disease, constipation, and dropsy. If you notice any unusual behavior or symptoms in your fish, such as difficulty swimming or bloating, consult with a veterinarian who specializes in aquarium fish.

Remember, prevention is key when it comes to keeping your cochus blue tetras healthy. By maintaining a clean and well-balanced environment, providing a nutritious diet, and monitoring your fish for signs of illness, you can help ensure that they thrive in your aquarium for years to come.

Enhancing Your Cochus Blue Tetra’s Environment

Creating a visually appealing and stimulating environment is essential for the wellbeing of your small tropical fish. Here are some tips to enhance your cochus blue tetra’s habitat:

  • Live plants: Adding live plants to your aquarium not only enhances the aesthetics of your tank but also creates a natural habitat for your colorful fish. Plants such as Amazon sword and Java ferns are great options for your cochus blue tetra.
  • Decorations: Incorporating decorations such as caves, rocks, and driftwood can create hiding spots and caves for your fish to explore and play in.
  • Proper lighting: Adequate lighting is crucial for the growth of live plants and can also highlight the vibrant colors of your fish.

Remember to avoid over-decorating your aquarium and always ensure there is plenty of space for your fish to swim freely.

You can also consider adding a background to your aquarium, such as a poster or paint. This can help enhance the colors of your fish and create a more attractive display.

“A well-decorated aquarium not only looks visually appealing but also provides a stimulating environment for your small tropical fish.”

Interacting with Your Cochus Blue Tetra

One of the joys of having small tropical fish as pets is the opportunity to interact with them. The cochus blue tetra is no exception, and with a little effort, you can establish a harmonious bond with your fish.

First and foremost, it’s essential to create a calm and stress-free environment for your cochus blue tetra. Avoid sudden movements, loud noises, or overcrowding the aquarium with too many fish or decorations. Provide a balanced diet, clean water, and suitable living conditions.

Once your fish feels comfortable and secure, you can begin to engage in some simple activities and games. Try moving your finger or a small object around the tank, and watch as your fish follows it with its eyes and body movements. You can also use a mirror to reflect your fish’s image, which can stimulate territorial behavior and showcase its beautiful colors.

Another fun way to interact with your cochus blue tetra is by training it to respond to your touch. Start by gently tapping the glass near your fish and rewarding it with a small piece of food. Repeat this process several times, and soon your fish will associate your touch with positive reinforcement.

Remember to be patient and consistent with your interactions. Building trust and a bond with your fish takes time and effort. But the rewards are well worth it, as you witness your cochus blue tetra’s charming personality and captivating beauty.

Troubleshooting Guide

If you are having issues with your blue tetra fish, don’t worry; there are solutions to many common problems.

Fin Rot

Fin rot is a bacterial infection that can affect all fish species, including cochus fish. It is characterized by ragged or decaying fins and may cause the fins to fall off. To treat fin rot:

  1. Check your water quality and change the water regularly.
  2. Remove any decaying plant matter or uneaten food from the tank.
  3. Use a commercial anti-bacterial medication recommended for treating fin rot.
  4. Follow the medication instructions and continue treatment until the fins stop deteriorating and start to heal.

Behavioral Issues

If you notice erratic or unusual behavior in your fish, it could be a sign of stress or illness. Some common behavioral issues include:

  • Swimming upside down
  • Not eating
  • Hiding
  • Aggressive behavior towards other fish

To address these issues:

  1. Check your water quality to ensure that it is not the cause of the problem.
  2. Ensure that your fish have plenty of hiding places and enough space to swim without feeling overcrowded.
  3. Try to reduce any stress factors, such as sudden temperature changes or introducing new fish to the tank.
  4. If the issue persists, consult a veterinarian or a fish expert for advice.

High Ammonia Levels

High ammonia levels in your tank can be very harmful to your cochus fish and other fish species. To reduce ammonia levels:

  1. Change the water in the tank regularly.
  2. Decrease the amount of food you give your fish, as uneaten food is a major source of ammonia.
  3. Make sure the tank is well-filtered and cycled before adding any new fish.
  4. Test the water regularly for ammonia levels, and adjust your maintenance routine accordingly.

By following these troubleshooting tips, you can help ensure the health and well-being of your cochus blue tetra and other fish species in your aquarium.


I hope you enjoyed learning about the cochus blue tetra and why it’s one of my favorite pet fish! As you now know, this small tropical fish is a wonderful addition to any home aquarium with its vibrant colors, easy-care nature, and engaging personality.

Whether you’re a beginner or an experienced aquarium enthusiast, the cochus blue tetra is an ideal fish species for you. With its peaceful temperament, it gets along well with other small fish species, making it a great choice for community tanks.

Creating a suitable home for your cochus blue tetra is easy, and providing a nutritious diet is essential for its growth and overall health. Breeding and reproduction can also be a fun and rewarding experience, but it’s important to know how to care for the fry properly.

If you encounter any issues with your cochus blue tetra, this article has provided tips and advice to help you address them. And don’t forget to interact with your fish – playing simple games and activities can enrich their lives and create a harmonious bond between you both.

So, what are you waiting for? Start your cochus blue tetra journey today and discover the wonders of this fascinating fish species.


What is the cochus blue tetra?

The cochus blue tetra is a small tropical fish known for its vibrant colors and lively nature. It is a popular choice among aquarium enthusiasts.

Where does the cochus blue tetra originate from?

The cochus blue tetra is native to South America, specifically the Amazon River basin.

What are the physical characteristics of the cochus blue tetra?

The cochus blue tetra has a sleek body with shimmering blue scales. It grows to a maximum size of around 1.5 inches (4 cm) and has a peaceful demeanor.

What kind of tank setup is suitable for the cochus blue tetra?

The cochus blue tetra prefers a well-maintained aquarium with plenty of hiding spots and vegetation. A minimum tank size of 10 gallons is recommended.

What should I feed my cochus blue tetra?

The cochus blue tetra is an omnivorous fish that enjoys a varied diet consisting of high-quality flakes, pellets, frozen or live foods like brine shrimp or daphnia.

Can I breed cochus blue tetra in my aquarium?

Yes, cochus blue tetras can breed in a well-maintained aquarium. They are egg scatterers, and breeding can be stimulated by providing the right conditions, such as soft, acidic water and plenty of plants for the eggs to attach to.

What are some common health concerns for cochus blue tetras?

Common health concerns for cochus blue tetras include fin rot, ich, and swim bladder issues. Regular water changes, maintaining proper water parameters, and a balanced diet can help prevent these issues.

How can I enhance my cochus blue tetra’s environment?

You can enhance your cochus blue tetra’s environment by adding live plants, decorations, and providing suitable lighting. This will create a visually appealing and stimulating habitat for your fish.

How can I interact with my cochus blue tetra?

Interacting with your cochus blue tetra can be as simple as watching them swim or feeding them by hand. They are curious fish and will appreciate your presence and attention.

What should I do if I encounter any issues with my cochus blue tetra?

If you encounter any issues with your cochus blue tetra, such as fin rot or behavioral problems, refer to our troubleshooting guide for tips and solutions to common problems.


  1. International Federation of Online Clubs and Aquatic Societies (IFOCAS)
  2. Federation of British Aquatic Societies (FBAS)
  3. Northeast Council of Aquarium Societies (NEC)
  4. Federation of American Aquarium Societies (FAAS)
  5. Ornamental Aquatic Trade Association (OATA)



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