Blue Green Chromis Care: Tank Setup, Diet, Tank Mates, Diseases & More!

If you’re looking for a colorful and lively addition to your saltwater aquarium, the Blue Green Chromis might just be the perfect fish for you. These small, vibrant fish are a popular choice for both beginner and experienced aquarists alike. With their striking blue-green coloration and playful personalities, they can add a lively touch to any tank.

Blue Green Chromis require a well-filtered aquarium with plenty of swimming space. They are peaceful and should be kept in groups of at least six. They feed on high-quality flakes and frozen foods, and their diet can be supplemented with live foods. Regular water changes and maintenance are essential for their health.

But before you bring home a Blue Green Chromis, it’s important to understand their care requirements. These fish are relatively easy to care for, but they do have specific needs when it comes to their environment, diet, and social behavior. With the right care, your Blue Green Chromis can thrive and bring joy to your aquarium for years to come.

I remember when I first added a Blue Green Chromis to my tank. Watching it dart around the rocks and interact with its tankmates was a truly mesmerizing experience. But I quickly realized that I needed to do my research to ensure that I was providing the best care possible for my new fish. In this article, we’ll cover everything you need to know to provide excellent care for your Blue Green Chromis.

Blue Green Chromis 2

Species Summary

If you’re considering adding a Blue Green Chromis to your aquarium, it’s important to know about their care requirements.

Here’s what you need to know:


The Blue Green Chromis is native to the Indo-Pacific region, including the Red Sea, the Great Barrier Reef, and various other locations.

They are commonly found in shallow waters around coral reefs.


With proper care, Blue Green Chromis can live up to 8 years in captivity.


Blue Green Chromis are a beautiful, vibrant blue-green color with a yellow underside.

They have a slender, elongated body and a forked tail. Their scales have a metallic sheen that adds to their beauty.


Blue Green Chromis typically grow to be around 3 inches in length.

Growth Rate

Blue Green Chromis are relatively fast growers and can reach their full size in just a few months.

Behavior & Temperament

Blue Green Chromis are a peaceful fish that can be kept in groups.

They are known for their playful and active behavior, and they are constantly swimming around the tank. They are also known to be jumpers, so a tight-fitting lid is essential.

Male vs Female

It can be difficult to tell the difference between male and female Blue Green Chromis. However, males are typically slightly larger and more colorful than females.

Personally, I have found that Blue Green Chromis are a great addition to any saltwater aquarium.

Their vibrant color and playful behavior make them a joy to watch. Just make sure to provide them with a suitable environment and they will thrive in your care.

Tank Setup

Setting up a suitable environment for your Blue Green Chromis is essential for their health and well-being.

Here are the key factors to consider when setting up your tank:

Tank Size

The minimum tank size for a school of Blue Green Chromis is 30 gallons.

However, if you plan to keep other fish in the same tank, you should increase the tank size accordingly. Keep in mind that the more space you provide, the happier and healthier your fish will be.


Blue Green Chromis require moderate to high lighting levels to thrive.

LED lights are a popular choice as they provide the required brightness without producing too much heat.

It’s important to ensure that the lighting is on for 8-10 hours per day to mimic the natural day and night cycle.

Filtration & Aeration

A good filtration system is crucial for maintaining water quality and keeping your fish healthy. A combination of mechanical, chemical, and biological filtration is recommended.

Additionally, aeration is essential to ensure that there is enough oxygen in the water for your fish to breathe.


Blue Green Chromis require a water temperature between 76-82°F. A reliable heater is necessary to maintain a consistent temperature in the tank.

It’s recommended to use a heater with a built-in thermostat to ensure that the water temperature stays within the desired range.


A fine-grained sand substrate is ideal for Blue Green Chromis as it mimics their natural habitat. A depth of 1-2 inches is sufficient.

Avoid using large gravel or sharp-edged substrates as they can injure your fish.


Blue Green Chromis enjoy having plenty of hiding places, so it’s important to provide adequate decorations.

Rocks, caves, and other structures can be used to create hiding spots. However, be sure to leave plenty of open swimming space as well.


While Blue Green Chromis do not require live plants, they can add to the overall aesthetic of the tank.

If you choose to include live plants, make sure they are compatible with the lighting and water conditions in your tank.

When setting up your Blue Green Chromis tank, it’s important to keep in mind their natural habitat and behaviors.

Providing a suitable environment will ensure that your fish are healthy, happy, and thriving.

Personally, I’ve found that adding a few small caves and rocks to my Blue Green Chromis tank has made a big difference in the happiness of my fish.

They love to swim in and out of the hiding spots and seem to be more active overall. By following these tank setup guidelines, you can create a similar environment for your fish to enjoy.

Water Quality

When it comes to keeping Blue Green Chromis healthy, maintaining good water quality is essential.

Here are some key factors to consider:

Water Temperature

The ideal water temperature for Blue Green Chromis is between 72 and 78 degrees Fahrenheit.

A reliable aquarium heater can help you maintain a consistent temperature.

Water pH

The pH level of your aquarium water should be between 8.1 and 8.4.

You can use a pH testing kit to monitor the levels and make adjustments as needed.

Water Hardness

Blue Green Chromis prefer water that is moderately hard, with a range of 8-12 dKH.

You can test your water hardness with a test kit and adjust it by adding or removing minerals.

Water Changes

Regular water changes are crucial for maintaining good water quality. Aim to change 10-20% of the water in your aquarium every 1-2 weeks.

This will help remove excess waste and replenish essential minerals and nutrients.

Personally, I have found that keeping a consistent water change schedule has greatly improved the health and vitality of my Blue Green Chromis. By taking the time to monitor and maintain good water quality, you can help ensure that your fish thrive in their aquatic environment.

Tank Maintenance

Maintaining a healthy and clean tank is essential for the well-being of your Blue Green Chromis.

Here are a few tips to keep your tank in top shape:

First, make sure you have the right equipment. A good filter, heater, and protein skimmer are essential for keeping your tank clean and healthy.

You should also have a test kit to monitor the water parameters regularly.

Next, perform regular water changes. A 10-20% water change once a week is recommended. This helps remove waste and toxins from the water and replenish essential minerals and nutrients.

Keep an eye on the temperature and salinity levels. Blue Green Chromis thrive in a temperature range of 75-82°F and a salinity level of 1.020-1.025.

Use a thermometer and hydrometer to monitor these levels regularly.

Finally, keep the tank clean. Regularly remove any uneaten food, dead plants, or debris from the tank. You can also use a gravel vacuum to clean the substrate and remove any waste that has settled on the bottom of the tank.

Personally, I find that maintaining my tank is therapeutic. It’s a great way to destress and take a break from the daily grind. Plus, watching my Blue Green Chromis swim around in a clean and healthy environment is incredibly rewarding.

Tank Mates

When it comes to selecting tank mates for your Blue Green Chromis, there are a few things you should consider. Here are some factors to keep in mind:

Compatible Fish Species

Blue Green Chromis are generally peaceful fish and can be kept with a variety of other marine species. Some good options for tank mates include:

  • Clownfish
  • Gobies
  • Damsels
  • Tangs
  • Blennies

These fish tend to have similar temperaments and can coexist peacefully in the same tank.

Just be sure to provide enough space and hiding spots for each fish to establish their own territory.

Incompatible Fish Species

While Blue Green Chromis are generally peaceful, there are some fish species that may not be compatible with them. Some fish to avoid keeping with Blue Green Chromis include:

  • Aggressive or territorial fish
  • Larger predator fish
  • Fish that are known to nip at fins or harass other fish

It’s important to research any potential tank mates before adding them to your aquarium to ensure they are compatible with your Blue Green Chromis.

How Many Blue Green Chromis Should I Keep?

Blue Green Chromis 3

Blue Green Chromis are social fish and thrive in groups. It’s recommended to keep at least 3-5 Blue Green Chromis together in a tank. This will help them feel more comfortable and reduce stress.

However, it’s important not to overcrowd your tank. Be sure to provide enough space for each fish to swim and establish their own territory. As a general rule, you should allow 1 gallon of water per inch of fish.

In my experience, I’ve found that keeping a small group of Blue Green Chromis together can be quite entertaining. They tend to swim in synchrony and create a beautiful, calming effect in the tank.


Proper nutrition is essential for the health and wellbeing of your Blue Green Chromis. Here are some guidelines to keep in mind when feeding your fish:

What To Feed

Blue Green Chromis are omnivores, which means they eat both plant and animal matter. In the wild, they feed on plankton, algae, and small crustaceans. In captivity, you can feed them a variety of foods, including:

  • Flake or pellet food specifically designed for marine fish. Look for a high-quality brand that contains a mix of proteins, vitamins, and minerals.
  • Frozen or live brine shrimp, krill, or mysis shrimp. These can be a tasty treat for your fish and provide some variety in their diet.
  • Fresh or frozen algae. Blue Green Chromis love to nibble on algae, so consider adding some to their diet.


It’s important to feed your Blue Green Chromis small amounts of food several times a day rather than one large meal.

This will help prevent overfeeding and ensure that your fish are getting the nutrients they need.

A good rule of thumb is to feed your fish as much as they can eat in 2-3 minutes, two to three times per day.


Here are some additional tips to keep in mind when feeding your Blue Green Chromis:

  • Don’t overfeed your fish. Overfeeding can lead to health problems and poor water quality in your aquarium.
  • Make sure the food you’re feeding your fish is appropriate for their size. Small fish need small food particles, while larger fish can handle larger pieces of food.
  • Consider using a feeding ring or target feeding your fish to prevent food from floating away and to ensure that all of your fish are getting enough to eat.

Personally, I’ve found that my Blue Green Chromis are particularly fond of frozen brine shrimp. I like to mix it up and give them a variety of foods, but the brine shrimp seems to be their favorite.

Just be sure not to overfeed them, as it can lead to some messy consequences!

Common Diseases


Blue Green Chromis are generally hardy fish and can live up to 8 years with proper care.

However, they are still susceptible to certain diseases. Some of the most common diseases that affect Blue Green Chromis are:

  • Ich (white spot disease)
  • Velvet disease
  • Fin rot
  • Mouth fungus


If your Blue Green Chromis is sick, you may notice the following symptoms:

  • White spots on the body and fins (Ich)
  • Yellow or brown dust-like spots on the body (Velvet disease)
  • Ragged or frayed fins (Fin rot)
  • White or gray patches on the mouth or body (Mouth fungus)


If you notice any of the above symptoms, it is important to take action immediately to prevent the disease from spreading to other fish in your tank. Treatment options include:

  • Medications specifically designed to treat the disease
  • Increasing the water temperature to speed up the fish’s metabolism and immune system
  • Adding aquarium salt to the water to help reduce stress and prevent secondary infections


Preventing diseases in Blue Green Chromis is all about providing them with a healthy environment. Here are some tips to help prevent diseases:

  • Keep the water clean and well-maintained
  • Don’t overfeed your fish
  • Quarantine new fish before adding them to your tank
  • Avoid overcrowding your tank

I have personally experienced the devastating effects of Ich on my Blue Green Chromis. I noticed white spots on its fins and body, and it became lethargic and stopped eating.

I immediately started treatment with medication and increased the water temperature. After a few days, the white spots disappeared, and my fish started to eat again.

It’s important to act quickly when you notice any symptoms to prevent the disease from spreading and causing more harm to your fish.

Signs of a Healthy Blue Green Chromis

If you want to keep your Blue Green Chromis healthy and happy, you need to know what to look for. Here are some signs that your fish is in good health:

  1. Active and alert behavior: A healthy Blue Green Chromis will swim around actively and be curious about its surroundings. If your fish is lethargic or hiding, it may be a sign of illness or stress.
  2. Bright colors: The Blue Green Chromis is known for its stunning blue-green coloration. A healthy fish will have bright, vibrant colors with no signs of fading or discoloration.
  3. Clear eyes: The eyes of a healthy Blue Green Chromis should be clear and bright, with no cloudiness or discharge.
  4. Healthy fins: The fins of a healthy fish should be intact and free of any tears or fraying. Damaged fins can be a sign of poor water quality or aggression from other fish in the tank.
  5. Good appetite: A healthy Blue Green Chromis will have a good appetite and eagerly eat the food you provide. If your fish is not eating or seems disinterested in food, it may be a sign of illness.

It’s important to keep a close eye on your Blue Green Chromis and monitor its behavior and appearance regularly. If you notice any changes in its behavior or appearance, it’s important to take action quickly to address any potential health issues.

Personally, I have found that my Blue Green Chromis are very active and playful fish. They love to swim around and explore their environment, and I always enjoy watching them interact with each other.

By keeping an eye on their health and providing them with a healthy and stimulating environment, I have been able to keep my Blue Green Chromis happy and healthy for many years.

Signs Your Blue Green Chromis Is Sick

If you are a proud owner of a Blue Green Chromis, you want to ensure that it is always healthy and happy. However, sometimes even with the best care, your fish may get sick. Here are some signs to look out for:

  1. Lack of Appetite: If your Blue Green Chromis is not eating, it could be a sign of illness. Observe your fish during feeding times to see if it is eating or not.
  2. Lethargy: If your fish is not swimming as much as it used to, or if it is spending more time at the bottom of the tank, it could be a sign of sickness. A healthy Blue Green Chromis is usually active and swims around the tank.
  3. Abnormal Breathing: If your fish is breathing rapidly or gasping for air, it could be a sign of a respiratory infection or other health problems.
  4. Discoloration: If your Blue Green Chromis has lost its vibrant color and looks pale or discolored, it could be a sign of stress or illness.
  5. Visible Signs of Disease: Keep an eye out for any visible signs of illness, such as white spots, fin rot, or lesions on the fish’s body. These could be signs of disease or infection.

Personal Anecdote: I once had a Blue Green Chromis that stopped eating and became lethargic. I immediately checked the water quality and found that the ammonia levels were high. After doing a water change and adding some beneficial bacteria, my fish started eating again and became more active. It’s important to always monitor the water quality and take action if you notice any signs of illness in your fish.


Breeding Setup

To breed Blue Green Chromis, you will need a breeding setup that mimics their natural habitat. Start with a large tank, 50 gallons or more, with plenty of live rock and hiding places.

The tank should be well-filtered and have stable water parameters. You will also need a breeding cone or slate, which can be purchased online or at your local fish store.

How To Breed

Blue Green Chromis

Breeding Blue Green Chromis is relatively easy. Once you have your breeding setup in place, introduce a mated pair of fish to the tank.

The male will begin to court the female by swimming in a figure-eight pattern around her. Eventually, the female will lay eggs on the breeding cone or slate, and the male will fertilize them.

After spawning, the eggs will hatch in 2-3 days. The fry will be free-swimming in about 5 days and will need to be fed small amounts of rotifers or baby brine shrimp several times a day.


Once the fry are free-swimming, it’s important to keep the tank clean and well-fed. Perform regular water changes to maintain stable water parameters and feed the fry small amounts of food several times a day.

As they grow, you can gradually increase the size of their food. It’s also important to keep an eye on the male during the breeding process.

He may become territorial and aggressive towards other fish in the tank. If this happens, you may need to remove him temporarily until the eggs hatch.

I have personally bred Blue Green Chromis and found it to be a rewarding experience. Watching the courtship and spawning process is fascinating, and raising the fry is a fun challenge. Just remember to be patient and provide a suitable breeding setup and care for the fry.

Product recommendations for Blue Green Chromis:

  1. Omega One Super Color Flakes – This is a high-quality fish food that is perfect for Blue Green Chromis. It contains all the essential nutrients that your fish need to stay healthy and vibrant.
  2. Coralife Biocube Aquarium – This is a great aquarium kit that is perfect for Blue Green Chromis. It comes with everything you need to get started, including a filter, heater, and LED lighting.
  3. API Aquarium 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.
  4. Seachem Prime – This is a water conditioner that helps to detoxify ammonia, nitrite, and nitrate in your aquarium. It is safe for use with Blue Green Chromis and other fish.
  5. CaribSea Ocean Direct Live Sand – This sand is perfect for creating a natural environment for your Blue Green Chromis. It contains live bacteria and is easy to maintain.
  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 Blue Green Chromis healthy.
  8. Fluval Sea Protein Skimmer – This protein skimmer is perfect for removing organic waste from your aquarium. It is easy to install and maintain, and will keep the water in your aquarium clean and healthy.
  9. NICREW ClassicLED Aquarium Light – This LED light is perfect for illuminating your aquarium and showcasing your Blue Green Chromis. It is energy-efficient and easy to install.
  10. Instant Ocean Reef Crystals – This is a high-quality salt mix that is perfect for creating a healthy and natural environment for your Blue Green Chromis. It contains all the essential minerals and trace elements that your fish need to thrive.


Now that you have read this article, you should have a good understanding of how to care for Blue Green Chromis. Remember to always provide a healthy and clean environment for your fish, and feed them a balanced diet.

Additionally, it’s important to note that while Blue Green Chromis are generally hardy and easy to care for, they still require attention and care. Make sure to monitor their behavior and health regularly, and address any issues promptly.

One thing I’ve learned from my experience with Blue Green Chromis is that they are social creatures who thrive in groups. Watching them swim and interact with each other is truly a sight to behold. If you have the space and resources, consider adding a few more to your tank.

Overall, caring for Blue Green Chromis can be a rewarding and enjoyable experience. With the right knowledge and care, you can provide your fish with a happy and healthy life in your aquarium.


If you’re considering bringing home a Blue Green Chromis, you may have some questions about how to take care of them. Here are some frequently asked questions about caring for Blue Green Chromis:

Q: How often should I feed my Blue Green Chromis?

A: Blue Green Chromis are omnivores and should be fed a varied diet of frozen or live foods, as well as high-quality pellets or flakes. Feed them small amounts 2-3 times a day, and adjust the amount based on how much they eat in a few minutes.

Q: Do Blue Green Chromis need a lot of space?

A: Blue Green Chromis are schooling fish that need a minimum tank size of 30 gallons for a small group of 5-6 fish. They are active swimmers and need plenty of open swimming space, as well as hiding places.

Q: Can Blue Green Chromis live with other fish?

A: Yes, Blue Green Chromis are peaceful fish and can live with other non-aggressive fish that are similar in size. Avoid keeping them with larger, aggressive fish that may bully or eat them.

Q: Do Blue Green Chromis need special water conditions?

A: Blue Green Chromis prefer a temperature range of 75-82°F and a pH level of 8.1-8.4. They also need a stable, well-filtered aquarium with a moderate water flow.

Personal Anecdote: I’ve had Blue Green Chromis in my aquarium for years, and they are some of my favorite fish. They are always active and fun to watch, and they get along well with other fish in my tank. I’ve found that feeding them a variety of foods, including frozen brine shrimp and high-quality pellets, keeps them healthy and happy.

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.

Leave a Reply

Recent Posts