Blue-green chromis is a beautiful and beginner-friendly fish. They are hardy and easy to care for. However, it does not mean that you stock and leave the tank. They require regular care and maintenance. Otherwise, they can die in captivity. In the following, you will learn why they die, how to take blue-green chromis care, different stocking options, i.e., tank size and tank mates of blue-green chromis, and many more.
Content Table
blue green chromis
Are Blue Green Chromis Aggressive
Generally, Blue-green Chromis fish are peaceful. However, when they are building a dominance hierarchy or defining their territory, they become aggressive. This aggression is only toward their specie. They try to nip the fins of other Blue Green Chromis. Otherwise, they are peaceful and social with other types of fish.
Blue Green Chromis Profile
Blue-green Chromis is a small marine fish that is naturally present in the Indo-Pacific region. It is distributed from East Africa to the Red Sea and from the Pacific Ocean to the Great Barrier Reef. They are known for their coloration, i.e., Iridescent blue-green body. Moreover, they change their color shade depending on their mood and light intensity.
Here are some other features of this Indo-Pacific Beauty.
| Feature | Description |
| Scientific name | Chromis viridis |
| Common name | Blue reef chromis |
| Blue Green chromis | |
| Family | Pomacentridae |
| Size | On average, 3 inches |
| Life | 8 to 15 years |
| Swimming level | Mid to upper level of the aquarium |
| Diet | Plankton |
| Specialized food pellet | |
| Flakes | |
| Mysis shrimps | |
| Brine shrimp | |
| Reef safe | Yes |
| Suitable tank size | 30+ gallons |
Blue Green Chromis Lifespan
The average size of a Blue-green Chromis lies between 2 and 3 inches. Maximally, they can grow up to 3.1 inches. Moreover, their size varies between males and females. Males grow larger than females. These saltwater beauties can live up to 8 to 12 years. However, they can live up to 15 years when everything is optimal.
Why Are My Blue Green Chromis Dying?
Blue-green Chromis are not tender. They are among the hardy fish, a common choice of beginners. However, certain conditions make them vulnerable to death. Sometimes, aquarists become worried about why my Blue Green Chromis is dying.
They are usually susceptible to protozoan disease, i.e., uronema. It causes soreness and ulcers. However, many other reasons can cause your fish’s death. Here are the reasons and how you can save your fish.
Common Reasons of Death
Uronema
It is a common protozoan disease that causes ulcers and sores on the body. Fish are susceptible to this during their beginning days in a tank.
Treatment:
It should be cured at the beginning. A 37% formalin bath and initial quarantine help to heal them from this disease.
Bacterial infections
The other reason that can lead your blue-green Chromis to death is bacterial infections. Usually, these infections are not fatal for healthy fish. However, weakfish are highly susceptible to death. Aeromonas hydrophila, Vibrio, and Pseudomonas are examples of bacterial infections.
Treatment:
- Improve the water quality.
- Identify the type of infections.
- Generally, you can cure these infections with antibacterial medications, i.e., oxytetracycline or erythromycin. However, a proper investigation will lead to a proper cure.
blue green chromis breeding
Water Quality
All fish are highly susceptible to water quality problems. Similar to other fish, they are also vulnerable to water parameters. The other reason for death is especially relevant for aquarium fish. The reason is that they are highly vulnerable to voltage. Even a slight voltage can cause death.
Cure:
Regularly check the water parameters, i.e., ammonia, nitrite, nitrate, pH, and salinity. Maintain their optimal level. Avoid direct exposure to electric voltage in the aquarium. If you are using these electric gadgets, insulate them properly.
Starvation
Starvation is another reason for your blue-green chromis fish’s death. They eat frequently in small quantities. If they are not fed multiple times daily, they can easily starve. This starvation causes death.
Cure:
Feed them multiple times daily in a small quantity. You can feed them via an intelligent fish feeder when you’re busy. Remove the leftover after 2 to 3 minutes to maintain water quality.
Acclimation
Usually, blue-green chromis become stressed due to the following reasons.
- Lack of acclimation
- The presence of bullying fish in their vicinity
If you directly introduce fish to your tank without proper acclimation, it leads to various issues.
- Stress
- Weaken their immune system
The weak immune system and stress contribute to their death.
Bullying
Blue-green Chromis are generally peaceful with other fish. However, when it comes to their specie, their aggression is visible. They can attack each other. Moreover, the bullying of tank mates also causes stress. As mentioned, stress weakens their immune system.
Cure
Use the drip acclimation method on your blue-green chromis before adding them to the tank. Quarantine your fish to avoid accidentally introducing disease to your main tank. Always add them to your main tank once they are acclimated and fully healthy.
If you are stocking multiple blue-green chromis in your tank, ensure that you provide them with optimal space. Add similar-sized and peaceful tank mates to avoid bullying.
blue green chromis care
Blue Green Chromis Care
Blue-green chromis are hardy and can survive various conditions. However, proper care is a must-have factor when you are having them. Here is a blue-green chromis care sheet.
Tank Size
Blue-green Chromis are schooling fish. For a small group of 3 to 5, a 30-gallon tank is required. They love to swim. Therefore, it should be horizontal, i.e., longer than the height of the tank. Other than the fish-only tank, you can keep them in your reef tank as they are reef-safe fish. Install a layer of sand or crushed coral as a substrate. Moreover, never forget to add live rocks and hiding spaces. They use these rocks to define their territory.
Water Parameters
Maintain the optimal water quality in the tank. Here are the optimal water parameters.
| Parameter | Value |
| Temperature | 72 to 80°F |
| pH | 8.1 to 8.4 |
| Salinity | 1.020 to 1.025 |
| Ammonia and Nitrite | 0 ppm |
| Nitrate | Less than 50 mg/L |
| Water flow | Moderate to Strong |
- It is necessary to change 10 to 25% water weekly.
- Replenish this volume with optimal parameters RO/DI water.
- Use a protein skimmer, water conditioner, and a good filtration system in your tank to maintain the water quality.
Lighting
Blue-green Chromis thrive in good lighting conditions. They require a medium light intensity for 8 to 10 hours daily. It’ll help to make their coloration more vibrant.
Diet
You can feed them with frozen or fresh brine shrimps, mysis shrimps, and finely chopped seafood. High-quality marine flakes and pellets are also a great option in processed food. Spirulina, zooplankton, and marine algae are their feast diet. You can feed them on and off.
Feed them 2 to 3 times with a light dose daily. Feed them in such a fashion that every fish eats their relative share. Avoid overfeeding. 2 to 3 minutes after feeding, remove the leftovers. Leftover removal will help to maintain the water quality.
Tank Mates
Sometimes, they become aggressive toward their specie. They do it due to their territorial behavior. However, it’s not their usual behavior. Keep them in a group of 5+ fish to reduce their aggression. Moreover, choose a similar size and peaceful species as a tank mate. Here is a list of suitable tank mates.
- Blennies
- Clownfish
- Basslets
- Yellow watchman Goby
- Butterflyfish
Health and Maintenance
Here are some health and maintenance tips that can increase their life up to 15 years.
- Always quarantine for 2 to 4 weeks to a new fish to avoid marine ich and uronema.
- Avoid stress-causing factors.
- Provide ample space for every fish.
How Many Blue-Green Chromis
How Many Blue-Green Chromis Should I Keep?
It’s not suitable to keep them alone or in a group of 2 to 3 fish. A group of a minimum of 5 blue-green chromis is suitable for stocking. Always introduce the entire group at once. Moreover, acclimating together also minimizes their aggression. Here are stocking ideas for different tank sizes.
30 to 40 Gallon Tank
It is a medium-sized, beginner-friendly, and minimum-sized tank for stocking blue-green chromis. It can house a group of 5 fish. You can also stock clownfish, royal gramma, and cleaner goby fish.
55 to 75 Gallon Tank
It’s a large size and somewhat more suitable for stocking blue-green chromis. In this tank, their natural behavior is more visible, and you can observe more communal harmony among them. Moreover, you can also stock firefish, reef-safe wrasses, tangs, and dwarf angelfish with them. Populating the tank with caves and overhangs is extremely helpful to reduce their stress.
90 to 125+ Gallon Tank
It is a giant or extra-large aquarium that can hold a community of 10 to 15 blue-green chromis. This tank reveals their stunning coloration and active and schooling behavior. It also helps to create a more natural habitat for them.
Closing Remarks
Blue-green chromis is a colorful and hardy marine fish. They are usually not susceptible to diseases. However, some bacterial infections and uronema can cause severe damage, even death. Starvation, bad water quality, and acclimation are some other leading causes. Proper tank size, lighting, optimal water parameters, diet, and suitable tank mates can help them live for up to 15 years. A 30-gallon tank is ideal for beginners. However, if you have experience and want to see their true color, stock them in a 90 to 125+ gallon tank.
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