Diamond Tetra Care: Tank Setup, Diet, Tank Mates, Diseases & More!

As an aquarium enthusiast, I’ve had my fair share of experiences with different fish species. One of my favorites is the Diamond Tetra, a small and colorful freshwater fish that’s perfect for beginners and experienced fish keepers alike. However, caring for these fish requires some attention to detail, which is why I’ve put together this guide to help you take care of your Diamond Tetras.

Diamond Tetras require a well-planted aquarium with soft, slightly acidic water. They should be kept in groups of at least six and fed a varied diet of high-quality flakes, pellets, and frozen foods. Regular water changes and maintenance are essential for their health.

In this article, I’ll cover everything you need to know about Diamond Tetra care, from their preferred tank conditions, to their diet and behavior. We’ll also discuss some common issues that may arise when caring for these fish, and how to prevent and treat them.

Whether you’re new to fish keeping or looking to add some Diamond Tetras to your existing aquarium, this guide will provide you with all the information you need to keep your fish healthy and happy.

Diamond Tetra Care

Species Summary

When it comes to Diamond Tetra care, it’s important to understand their basic characteristics. Here’s what you need to know:


I have always been fascinated by the Diamond Tetra, which is a freshwater fish that is native to the Amazon River basin in South America.

These fish are often found in slow-moving rivers, streams, and flooded forests, where they feed on small insects, crustaceans, and other small aquatic creatures.


Diamond Tetras have a relatively long lifespan, with some individuals living up to 5 years in captivity.

However, their lifespan can be affected by a number of factors, including water quality, diet, and stress levels.


One of the most striking features of the Diamond Tetra is its diamond-shaped body, which is silver in color with a distinctive black stripe that runs from the base of the tail to the gills.

These fish also have a bright red tail and a black spot on their dorsal fin.


Diamond Tetras are relatively small fish, with adult males growing to a maximum length of around 2 inches, while females are slightly smaller, reaching a maximum length of around 1.5 inches.

Growth Rate

The growth rate of Diamond Tetras can vary depending on a number of factors, including water quality, diet, and temperature.

However, in general, these fish grow relatively slowly, reaching their full size in around 6 months to a year.

Behavior & Temperament

Diamond Tetras are generally peaceful fish that do well in community aquariums. They are active swimmers and enjoy having plenty of space to move around.

However, they can be a bit skittish and may become stressed if kept with more aggressive or territorial fish.

Male vs Female

It can be difficult to tell male and female Diamond Tetras apart, as both sexes have similar coloring and body shape.

However, males are generally slightly larger and more colorful than females, with brighter red tails and more pronounced black spots on their dorsal fins.

Overall, Diamond Tetras are a fascinating and beautiful fish that can make a great addition to any community aquarium.

With proper care and attention to their needs, these fish can live long and healthy lives in captivity.

One time, I was watching my Diamond Tetras swim around their tank, and I noticed that one of them seemed to be swimming a bit slower than the others.

Upon closer inspection, I realized that it had a small injury on its tail. I immediately took steps to treat the injury and monitor the fish closely, and within a few days, it was back to its normal, active self.

This experience taught me the importance of paying close attention to my fish and being proactive about their health and well-being.

Tank Setup

Before bringing Diamond Tetras home, it is important to set up their tank properly. Here is what you need to know:

Tank Size

As a general rule, Diamond Tetras require a minimum of 10 gallons of water per fish.

However, I recommend going for a larger tank, especially if you plan to keep a group of them. A 20-gallon tank is a good starting point for a small group of 6-8 Diamond Tetras.


While Diamond Tetras do not require special lighting, it is important to provide a consistent light cycle for their well-being.

Aim for 8-10 hours of light per day, and make sure to turn off the light at night to give them a natural day-night cycle.

Filtration & Aeration

A good filtration system and aeration are crucial for Diamond Tetras’ health. A hang-on-back filter or a canister filter is ideal for keeping the water clean and clear.

Additionally, a small air pump and air stone will provide the necessary oxygenation for your fish.


Diamond Tetras are tropical fish and require a consistent water temperature of 75-82°F. A reliable heater is a must-have for maintaining the right temperature in the tank.


When it comes to substrate, Diamond Tetras are not too picky. You can use sand, gravel, or a combination of both.

Just make sure the substrate is clean and free of sharp edges that could harm your fish.


Adding some decorations to the tank will not only make it look more appealing but also provide hiding spots for your Diamond Tetras.

You can use rocks, driftwood, or artificial ornaments, but make sure they are aquarium-safe and do not affect the water chemistry.


Live plants are a great addition to any Diamond Tetra tank. They not only provide natural hiding spots but also help maintain good water quality by absorbing nitrates.

Some good plant options include Java Fern, Anubias, and Amazon Sword.

Setting up a Diamond Tetra tank can be a fun and rewarding experience. By following these guidelines, you can create a healthy and stimulating environment for your fish to thrive in.

Diamond Tetra Care 2

Personally, I love adding some live plants to my Diamond Tetra tank. Watching them swim around and interact with the plants is a sight to behold!

Water Quality

As a proud owner of Diamond Tetras, I know how important it is to maintain the right water quality in their tank. Here are some key factors to keep in mind:

Water Temperature

The ideal water temperature for Diamond Tetras is between 75-80°F (24-27°C).

I personally use a thermometer to monitor the water temperature and adjust the heater accordingly. Sudden changes in temperature can be stressful for the fish, so it’s important to make any adjustments gradually.

Water pH

Diamond Tetras prefer slightly acidic water with a pH level between 6.0-7.5.

I use a pH testing kit to make sure the water is within this range. If the pH level is too high or too low, it can cause stress and health problems for your fish.

Water Hardness

Diamond Tetras thrive in soft to moderately hard water with a hardness level between 5-12 dGH. I use a water hardness testing kit to make sure the water is within this range.

If the water is too hard or too soft, it can affect the fish’s health and growth.

Water Changes

Regular water changes are crucial for maintaining the water quality in your Diamond Tetra tank. I typically change 25% of the water every 2 weeks.

However, if the tank is heavily stocked or the water quality is poor, more frequent water changes may be necessary. It’s important to use a dechlorinator when adding new water to the tank to remove any harmful chemicals.

By keeping these factors in mind and monitoring the water quality regularly, you can ensure that your Diamond Tetras are healthy and happy in their tank.

Tank Maintenance

Keeping a clean and healthy environment for your Diamond Tetras is crucial for their well-being. Here are some tips for maintaining your tank:

  1. Regular Water Changes: I change 20% of my tank’s water every week to ensure that the water quality remains optimal. This helps to remove any excess waste and debris that could harm my fish.
  2. Clean the Filter: I clean my filter every month to prevent any build-up of debris that could clog the filter and affect the water quality.
  3. Scrub the Glass: Algae can grow on the glass of your tank, which can be unsightly and affect the clarity of the water. I use an algae scraper to clean the glass every week during my water change.
  4. Test the Water: It’s important to test the water regularly to ensure that the pH, ammonia, nitrite, and nitrate levels are in the appropriate range. I test my water once a week to make sure that everything is within the safe range for my Diamond Tetras.
  5. Remove any Dead Plants or Fish: Dead plants or fish can contribute to poor water quality and should be removed as soon as possible. I check my tank daily to ensure that everything is healthy and thriving.

By following these simple maintenance tips, you can ensure that your Diamond Tetras live in a clean and healthy environment, which will help them thrive and live a long and happy life.

Tank Mates

Compatible Fish Species

I have found that Diamond Tetras are generally peaceful and get along well with other small, non-aggressive fish. Some good tank mates for Diamond Tetras include:

Diamond Tetra Care 3
  • Neon Tetras
  • Guppies
  • Corydoras Catfish
  • Otocinclus Catfish

Incompatible Fish Species

While Diamond Tetras are generally peaceful, there are some fish species that should be avoided as tank mates:

  • Aggressive fish such as Cichlids and Bettas
  • Large, predatory fish such as Angelfish and Oscars
Angelfish Care Guide pet people blog

How Many Diamond Tetras Should be Kept Together

I have found that Diamond Tetras are social fish and should be kept in groups of at least 6. This will help them feel more comfortable and reduce stress.

However, it is important not to overcrowd the tank, as this can lead to health problems for the fish.

When introducing new fish to the tank, it is important to do so slowly and carefully. Adding too many fish at once can cause stress and lead to health problems.

I recommend adding a few fish at a time and monitoring their behavior closely.

Overall, Diamond Tetras are a great addition to any community tank. With the right tank mates and proper care, they can thrive and provide years of enjoyment.

Personally, I have found that Diamond Tetras are a joy to watch and interact with. They are active and playful, and their shimmering scales add a beautiful touch to any tank.

I have had success keeping them with other small fish such as Neon Tetras and Corydoras Catfish, and I have found that they make a great addition to any community tank.


Feeding your Diamond Tetra a balanced diet is essential to ensure their health and longevity.

In this section, I will cover what to feed your tetras, how often to feed them, and some tips for maintaining a healthy diet.

What To Feed

When it comes to feeding your Diamond Tetra, variety is key. I like to offer a mix of high-quality flakes, pellets, and frozen foods such as bloodworms, brine shrimp, and daphnia.

It’s important to choose foods that are specifically formulated for tetras as they have different nutritional needs than other fish species.

One thing to keep in mind is that Diamond Tetras are omnivores, which means they eat both plant and animal-based foods.

Make sure to include some vegetable matter in their diet, such as spirulina flakes or blanched spinach, to ensure they are getting all the nutrients they need.


I typically feed my Diamond Tetras twice a day, once in the morning and once in the evening.

It’s important not to overfeed them, as this can lead to health problems such as bloating and constipation. A good rule of thumb is to only feed them what they can eat in 2-3 minutes.

It’s also a good idea to give your tetras a day of fasting once a week. This helps prevent digestive issues and gives their digestive system a chance to rest.


Here are a few tips to keep in mind when it comes to feeding your Diamond Tetras:

  • Make sure to remove any uneaten food from the tank after feeding to prevent water quality issues.
  • Offer a variety of foods to ensure they are getting all the nutrients they need.
  • Don’t overfeed them – only feed what they can eat in 2-3 minutes.
  • Consider using a feeding ring or target feeding to ensure all your tetras are getting their fair share of food.

By following these tips and providing a balanced diet, you can ensure your Diamond Tetras stay healthy and happy.

Personally, I’ve found that my Diamond Tetras love bloodworms and get really excited when they see me preparing to feed them.

It’s a joy to watch them swim around and eat, and it’s a great feeling knowing that I am providing them with the best possible care.

Common Diseases


I have been keeping Diamond Tetras for quite some time now, and I can tell you that they are relatively hardy fish.

However, like all living creatures, they are prone to certain diseases. Some of the most common diseases that Diamond Tetras can get include:

  • Ich
  • Fin Rot
  • Columnaris
  • Velvet

While these diseases can be serious, they can be treated if caught early.


It is important to keep an eye out for any changes in your Diamond Tetra’s behavior or appearance, as these can be signs of illness.

Some of the most common symptoms of the diseases mentioned above include:

  • White spots on the body and fins (Ich)
  • Frayed or disintegrating fins (Fin Rot)
  • White or gray patches on the body and fins (Columnaris)
  • Gold or rust-colored dust-like spots on the body (Velvet)

If you notice any of these symptoms, it is important to take action immediately.


If your Diamond Tetra is showing signs of illness, it is important to treat it as soon as possible. The first step is to isolate the sick fish from the rest of the tank to prevent the disease from spreading.

The next step is to treat the disease itself. There are several treatments available for each of the diseases mentioned above, including:

  • Ich medication
  • Antibiotics for Fin Rot and Columnaris
  • Medication for Velvet

It is important to follow the instructions on the medication carefully, and to continue treatment until the disease is completely gone.


Prevention is always better than cure. To prevent your Diamond Tetras from getting sick, it is important to maintain good water quality, feed them a balanced diet, and avoid overcrowding the tank.

You should also quarantine any new fish for at least two weeks before introducing them to the main tank. This will help prevent the spread of any diseases that they may be carrying.

By following these simple steps, you can help keep your Diamond Tetras healthy and happy.

Signs of a Healthy Diamond Tetras

As an aquarium enthusiast, I have learned that keeping fish healthy is crucial for their survival. Diamond Tetras are no exception. Here are some signs that your Diamond Tetras are healthy:

  1. Active Swimming: Healthy Diamond Tetras are active swimmers. They move around the aquarium, explore their surroundings, and interact with other fish. If your Tetras are hiding or staying in one place for too long, it could be a sign of illness.
  2. Bright Colors: Diamond Tetras have a distinctive diamond shape on their bodies, and their colors should be bright and vibrant. If their colors are dull or faded, it could be a sign of stress or illness.
  3. Clear Eyes: Healthy Diamond Tetras have clear eyes that are not cloudy or bulging. Cloudy or bulging eyes could be a sign of an infection or disease.
  4. Healthy Fins: Diamond Tetras have delicate fins that should be intact and not torn or frayed. Damaged fins could be a sign of aggression or poor water quality.

It is essential to monitor your Diamond Tetras regularly to ensure they remain healthy. If you notice any signs of illness or abnormal behavior, take action immediately to prevent the spread of disease or infections.

Signs Your Diamond Tetra is Sick

As a proud owner of diamond tetras, I know how important it is to keep a close eye on their health. These little fish are sensitive creatures and can fall ill quite easily. Here are some signs to look out for that may indicate your diamond tetra is sick:

  1. Loss of appetite
  2. Lethargy or lack of movement
  3. Abnormal swimming behavior
  4. Changes in color or appearance
  5. Rapid breathing or gasping at the surface of the water
  6. Visible signs of injury or disease, such as lesions or fungus

If you notice any of these symptoms, it’s important to take action right away. A sick diamond tetra can quickly infect other fish in the tank and spread disease.

One of my own diamond tetras recently fell ill with a fungal infection. I noticed that he was swimming erratically and had developed a white, cotton-like growth on his fins.

I immediately isolated him in a separate tank and treated him with an antifungal medication. After a few days, he began to show signs of improvement and eventually made a full recovery.

Remember, prevention is key when it comes to keeping your diamond tetras healthy. Make sure to maintain a clean and well-filtered tank, provide a balanced diet, and monitor your fish regularly for any signs of illness.


Breeding Diamond Tetras can be a fun and rewarding experience for any fish enthusiast. Here are some tips on how to successfully breed Diamond Tetras.

Breeding Setup

To breed Diamond Tetras, you will need a breeding tank that is at least 10 gallons in size. The breeding tank should be heavily planted with fine-leaved plants like Java Moss or spawning mops.

You will also need a sponge filter to keep the water clean and a heater to maintain a temperature of around 78°F.

How To Breed

To begin breeding, you will need a male and a female Diamond Tetra. You can tell the difference between the two by looking at their fins.

Males have longer and more pointed fins, while females have shorter and rounder fins. Once you have a male and a female, place them in the breeding tank and wait for them to spawn.

Diamond Tetras are egg layers, so the female will lay her eggs on the plants or spawning mop. The male will then fertilize the eggs.

After spawning, remove the adult fish from the breeding tank to prevent them from eating the eggs. The eggs will hatch in about 24-36 hours, and the fry will become free-swimming in about 3-4 days.


Once the fry become free-swimming, you will need to feed them small amounts of infusoria or liquid fry food several times a day.

As they grow, you can start feeding them baby brine shrimp or crushed flakes. It’s important to keep the water clean and well-oxygenated during the breeding process.

Perform regular water changes and monitor the water parameters to ensure that they are within acceptable levels.

I remember my first time breeding Diamond Tetras. I was so excited to see the eggs hatch and the fry grow. It was a lot of work, but it was worth it to see the new life that I had helped bring into the world.

Product recommendations for diamond tetras:

  1. TetraMin Plus Tropical Flakes – This is a high-quality fish food that is perfect for diamond tetras. It contains all the essential nutrients that your fish need to stay healthy and vibrant.
  2. API Aquarium Water Test Kit – It is important to keep an eye on the water quality in your aquarium, and this test kit makes it easy to do so. It includes tests for ammonia, nitrite, nitrate, and pH.
  3. Seachem Prime – This is a water conditioner that helps to detoxify ammonia, nitrite, and nitrate in your aquarium. It is safe for use with diamond tetras and other fish.
  4. Hikari Micro Pellets – These small pellets are perfect for diamond tetras, as they are easy to digest and contain a balanced mix of protein, fat, and fiber.
  5. Fluval Plant and Shrimp Stratum  – If you plan on keeping live plants in your aquarium, this substrate is a great choice. It provides the nutrients that plants need to thrive, and also helps to maintain a stable pH.
  6. AquaClear Power Filter  – This filter is highly effective at removing debris and maintaining water quality in your aquarium. It is also very quiet and easy to maintain.
  7. Aqueon Aquarium Water Changer  – This device makes it easy to perform regular water changes in your aquarium. It is designed to be safe and easy to use, and can help to keep your diamond tetras healthy.
  8. Marina LED Aquarium Kit – This is another great aquarium kit that is perfect for diamond tetras. It includes a filter, heater, and LED lighting, and is easy to set up and maintain.
  9. Fluval Spec V Aquarium Kit – This is a larger aquarium kit that is perfect for diamond tetras and other small fish. It includes a filter, heater, and LED lighting, and is designed to be easy to maintain.


Overall, caring for Diamond Tetras requires attention to detail and a commitment to providing a healthy environment. By following the guidelines outlined in this article, you can ensure that your Diamond Tetras live a long and healthy life.

I have personally found Diamond Tetras to be a joy to care for. Their vibrant colors and active personalities make them a wonderful addition to any aquarium. However, it’s important to remember that they are living creatures that require proper care and attention.

Remember to monitor water quality, provide a balanced diet, and create a suitable habitat for your Diamond Tetras. With a little effort, you can create a thriving aquarium that is home to happy and healthy Diamond Tetras.


When it comes to Diamond Tetra care, there are a lot of questions that come up. Here are some of the most frequently asked questions:

Q: How often should I feed my Diamond Tetras?

A: I find that feeding my Diamond Tetras twice a day works best. I give them a small pinch of high-quality flakes or pellets each time. If you notice that there is leftover food after a few minutes, you may be feeding them too much.

Q: How many Diamond Tetras should I keep together?

A: Diamond Tetras are social fish, so it’s best to keep them in groups of at least six. This will help them feel more comfortable and reduce stress.

Q: What temperature should the water be for Diamond Tetras?

A: Diamond Tetras prefer water that is between 75-82°F. It’s important to keep the temperature consistent, so investing in a good heater is a must.

Q: Do Diamond Tetras need a lot of space?

A: Diamond Tetras are a small fish, so they don’t need a lot of space. However, they do like to swim around, so it’s important to provide them with enough room to do so. A 20-gallon tank is ideal for a small school of Diamond Tetras.

Q: Can I keep Diamond Tetras with other fish?

A: Yes, Diamond Tetras are peaceful fish and can be kept with other non-aggressive community fish. Just make sure that the other fish are not too big or aggressive, as this can stress out your Diamond Tetras.

Q: Do Diamond Tetras need a lot of plants in their tank?

A: Diamond Tetras are not picky when it comes to plants, but having some live plants in their tank can help reduce stress and create a more natural environment. I like to add some floating plants to my Diamond Tetra tank to provide some shade and cover.

Overall, Diamond Tetras are a great addition to any aquarium. With the right care and attention, they can thrive and provide years of enjoyment.

Personally, I love watching my Diamond Tetras swim around and interact with each other. They are such beautiful and fascinating fish!

Reference: Wikipedia.


Hi there! My name is Jacob, and I'm the founder of this Pet people blog that talks all about aquarium and fishkeeping. I've been passionate about fish and aquatic life since I was a kid, and I've spent countless hours learning about different species, their habitats, and how to create the perfect environment for them to thrive in.

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