How Many Angelfish Can Stay Together? (With 7 Examples)

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Starting an aquarium with a group of angelfish is an engaging experience, particularly when you’re setting up their habitat for the first time.

This naturally leads to several important queries.

What is the maximum number of angelfish that can coexist peacefully in one aquarium? Is their gender a significant factor? Also, is it feasible to have just one angelfish in a tank?

Throughout this article, I’ll explore these issues in depth and others, so you leave with all the information you need. Let’s dive right into it.

How Many Angelfish Can Live Together in the Same Tank?

Determining how many angelfish can coexist in an aquarium depends on various factors, including tank size, angelfish size, and the environment within the tank. 

Here’s a short summary:

Tank Size (Gallons)Recommended Number of Angelfish

Also Read: Facts About Angelfish

20-Gallon Tank

In a 20-gallon tank, it’s best to start with just a pair of angelfish. These fish can grow quite large and require ample space to swim and establish territories.

  • Space per Fish: Angelfish can grow up to 6 inches in length and need about 10 gallons of water each to thrive.
  • Territorial Behavior: A smaller tank like this can limit the swimming space, potentially leading to stress and aggression among fish.
  • Tank Environment: For such a small group, a well-planted tank with hiding places helps in reducing stress and territorial disputes.

Also Read: Can You Keep Angelfish In A 20-Gallon Tank?

30-Gallon Tank

A 30-gallon tank can comfortably house two to three angelfish. This provides enough space for them to swim freely and establish individual territories.

  • Individual Territory: Each angelfish needs its own space. This tank size allows for distinct territories within the aquarium.
  • Swimming Space: More water volume provides better water quality and more swimming room, reducing stress-related issues.
  • Tank Decoration: Ample plants and decorations are essential to break the line of sight and prevent constant territorial confrontations.

Also Read: How Many Angelfish In A 30-Gallon Tank?

40-Gallon Tank

In a 40-gallon tank, three to four angelfish can be accommodated. This size allows for more individual space and helps in managing aggression.

  • Growth Consideration: Considering their potential size, this tank size allows for enough space as the fish grow.
  • Aggression Management: More room means less competition for resources, reducing aggressive behavior.
  • Environmental Enrichment: Adequate space for plants and decorations helps mimic a natural environment, promoting healthier fish behavior.

Also Read: How Many Angelfish In A 40-Gallon Tank?

55-Gallon Tank

A 55-gallon tank is ideal for a small group of about four to five angelfish. It offers ample swimming space and territory for each fish.

  • Group Dynamics: This size supports a small group without overcrowding, which is crucial for angelfish well-being.
  • Stress Reduction: More water volume dilutes toxins and reduces stress caused by poor water conditions.
  • Decorative Space: The tank can be richly decorated with plants and rocks, providing hiding spots and reducing aggression.

Also Read: How Many Angelfish In A 55-Gallon Tank?

75-Gallon Tank

With a 75-gallon tank, you can house five to six angelfish comfortably, ensuring each fish has enough space to thrive.

  • Social Interaction: A larger group can be maintained without significant stress, allowing for natural social interactions.
  • Water Quality Maintenance: Larger volume helps in maintaining stable water parameters, which is vital for angelfish health.
  • Habitat Simulation: Provides ample opportunity to create a diverse, enriching environment with various plants and decorations.

Also Read: How Many Angelfish In A 75-Gallon Tank?

125-Gallon Tank

A 125-gallon tank can support a larger group of about six to eight angelfish, offering plenty of room for each to establish its territory.

  • Large Group Dynamics: Allows for a larger community while still providing adequate space for individual territories.
  • Reduced Competition: With more space, competition for food and territory is significantly reduced, leading to less aggression.
  • Diverse Environments: The size allows for creating varied and interesting landscapes, mimicking natural habitats.

150-Gallon Tank

In a 150-gallon tank, a community of eight to ten angelfish can live harmoniously. This size provides ample space for each fish to grow and thrive.

  • Spacious Living: Offers abundant space for swimming and territory, crucial for the well-being of angelfish.
  • Harmonious Coexistence: Adequate space allows for a peaceful community with minimal aggression.
  • Optimal Water Conditions: Larger water volume ensures more stable water parameters, which is essential for the health of angelfish.

Can Angelfish Live in a Group?

Yes, angelfish can live in groups, but it requires careful management and understanding of their social dynamics.

They are naturally territorial, so the right tank conditions and setup are essential for group harmony.

  • Adequate Tank Size: Ensure your tank is large enough for a group; a 55-gallon tank can comfortably house 4-5 angelfish, giving them enough space to establish territories.
  • Proper Tank Setup: Create a habitat with plenty of plants and hiding spots. This breaks up lines of sight and reduces direct confrontations between the fish.
  • Regular Monitoring: Observe their behavior regularly for signs of bullying or stress, which can happen if the hierarchy within the group changes.
  • Feeding Strategies: Feed your angelfish in different tank areas to prevent competition and ensure all fish get their share of food.

What is the Ideal Number of Angelfish to Keep Together?

The ideal number of angelfish to keep together depends on the tank size and the environment you provide.

A well-set-up 55-gallon tank can comfortably house 4-5 adult angelfish.

  • Tank Size Consideration: For every angelfish, allocate at least 10 gallons of water. A larger tank reduces stress and aggression among them.
  • Group Composition: A balanced mix of males and females can help, but be aware of potential breeding-related aggression.
  • Social Dynamics: Angelfish can form hierarchies, so a group of 4-5 allows for natural social interactions without excessive aggression.
  • Breeding Consideration: If breeding occurs, be prepared for territorial behavior. It’s often best to separate a breeding pair to avoid conflict.

Also Read: Do Angelfish Need To Be In Groups?

Does the Gender Matter?

Yes, the gender of angelfish does matter, especially in a community tank setting.

The ideal ratio is often debated, but a common recommendation is to have a mix of both males and females, with a slightly higher number of females to males, such as a 2:1 ratio. 

This helps in reducing aggression, especially during breeding times when males can become more territorial.

Can You Have Two Male Angelfish?

Yes, you can have two male angelfish in the same tank, but it’s crucial to provide a large enough space and proper tank setup to minimize aggression.

Males can be territorial, so a larger tank with ample hiding spots and plants helps in managing their territorial behavior.

Regular monitoring of their interactions is also important to ensure a peaceful coexistence.

How to Tell If Your Angelfish Is a Male or a Female

Determining the gender of your angelfish is an essential step when considering the number of angelfish to keep in a tank.

This is important because the gender balance can greatly influence the social dynamics and harmony within the tank, especially as angelfish mature and develop territorial or breeding behaviors.

  • Body Shape: Males typically exhibit a bulkier, more angular body shape, especially around the head and shoulders. For instance, their foreheads are more pronounced, creating a noticeable nuchal hump as they mature.
  • Papilla Shape: During spawning, males develop a pointed, tube-like papilla for fertilizing eggs. This contrasts with females, whose papilla becomes wider and slightly rounded for laying eggs.
  • Fin Structure: Male angelfish usually have longer, more pointed dorsal and anal fins. For example, if you notice the dorsal fin extends well past the beginning of the tail, it’s likely a male.
  • Behavioral Clues: Males tend to be more territorial and may exhibit chasing behavior, especially in the presence of females or during breeding seasons.

Can You Keep a Single Angelfish in a Tank?

Yes, you can keep a single angelfish in a tank, and it can be quite happy if its environment is well-maintained.

While angelfish are often kept in groups, a solitary angelfish can thrive with proper care and attention.

  • Adequate Tank Size: Even for a single angelfish, a tank of at least 20 gallons is recommended to provide sufficient swimming space and reduce stress.
  • Enriched Environment: Decorate the tank with plants, rocks, and hiding places to stimulate the angelfish and keep it engaged in its environment.
  • Regular Interaction: Regular interaction with your angelfish, such as during feeding times, helps in reducing loneliness and promoting its well-being.
  • Stimulating Activities: Incorporating items that can provide mental stimulation, like mirrors or floating toys, can keep your angelfish entertained.

Also Read: Do Angelfish Get Lonely?

What Fish Can Live with Angelfish?

Several species of fish can coexist peacefully with angelfish, provided they have similar water requirements and temperaments.

When selecting tank mates, it’s important to choose species that won’t nip at the angelfish’s long fins or compete aggressively for food.

  • Dwarf Gouramis: Peaceful and similarly sized, dwarf gouramis can coexist well with angelfish without competing aggressively for food or space.
  • Corydoras Catfish: These bottom-dwellers are peaceful and do well with angelfish, helping to keep the tank clean by scavenging leftovers.
  • Mollies: Mollies are peaceful and adaptable, making them suitable companions for angelfish in a community tank.
  • Tetras: Smaller tetra species like neon or cardinal tetras can be good companions, but ensure they are not too small to be mistaken for food.
  • Loaches: Loaches, especially the smaller varieties like Kuhli Loaches, are peaceful and share the bottom space, staying out of the angelfish’s way.


For quick readers, here’s a short summary:

  • The ideal number of angelfish in a tank varies with tank size, ranging from 1-2 in a 20-gallon tank to 8-10 in a 150-gallon tank, ensuring enough space for each.
  • Angelfish require a minimum of 10 gallons of water each, with larger tanks promoting better health and less aggression through ample swimming space and territory.
  • Proper tank setup with ample plants and decorations is crucial for reducing stress and aggression among angelfish, especially in smaller tanks.
  • Gender balance is important in angelfish communities, with a recommended mix of both males and females to reduce breeding-related aggression.
  • Angelfish can coexist with other peaceful fish species that share similar water requirements, such as dwarf gouramis, corydoras catfish, mollies, tetras, and loaches.