How Many Angelfish In A 75-Gallon Tank? (With Examples)

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Having a 75-gallon tank offers you a variety of opportunities when it comes to relatively small fish species, such as angelfish.

But how many angelfish can actually live comfortably in a 75-gallon tank? What if you’re thinking of adding some other tank mates? Can you breed angelfish in a tank of this size?

In this article, I’ll address these questions and more, so that you leave with all the information you need. Let’s get started.

What’s the Ideal Number of Angelfish for a 75-Gallon Tank?

In a 75-gallon tank, ideally, you can keep 6 to 8 angelfish comfortably. This allows for each fish to establish its territory and thrive without excessive competition.

  • Space Allocation: Each angelfish requires about 10 gallons of space to grow and move comfortably. Thus, in a 75-gallon tank, 7-8 angelfish is the optimal number.
  • Territorial Nature: Angelfish can be territorial; by limiting the number to 6-8, you reduce the likelihood of aggression and constant territorial disputes.
  • Growth and Size: Adult angelfish can reach up to 6 inches in height. In a 75-gallon tank, accommodating 6 to 8 ensures they have ample space to grow without stress.
  • Tank Decor and Plants: Having 6 to 8 fish allows enough room for plants, decorations, and hiding spots, all essential for angelfish well-being and comfort.

Here’s how I typically make these calculations, following the 1-inch-per-gallon rule:

  • Determine the adult size of the fish: Angelfish grow up to 6 inches in height.
  • Use the 1-inch-per-gallon rule: 1 inch of fish per gallon of water.
  • Multiply tank size by 1 to get maximum inches of fish: 75 gallons x 1 = 75 inches.
  • Divide total inches by the adult size of the fish: 75 inches ÷ 6 inches = 12.5 angelfish.
  • Round down to ensure comfort and space: Ideally, house up to 12 adult angelfish in a 75-gallon tank.
  • Consider the fish’s territorial nature and need for swimming space: Reducing from the 12 allows for more comfort and territory per fish.
  • Take into account potential growth, movement, and decorations: Reducing the number to 6-8 angelfish ensures they have ample space without stress.

Also Read: Angelfish Tank Size

Recommended Male-to-Female Angelfish Ratio in a 75-Gallon Tank

In a 75-gallon tank, it’s advised to maintain a male-to-female angelfish ratio of 1:2 or 1:3. This balance ensures minimal aggression and maximizes breeding opportunities.

  • Minimized Aggression: With 1 male and 2-3 females, you’ll reduce male clashes. For 6 fish, try 2 males and 4 females.
  • Breeding Success: With 1 male for every 2-3 females, there’s a higher chance of a successful pair. For 8 fish, opt for 2 males and 6 females.
  • Stress Reduction: Distributing male attention across multiple females lessens pressure. This means fewer chase incidents per female.
  • Balanced Tank Dynamics: A 1:2 ratio ensures harmony. For instance, in a group of 7, you’d have 2 males and 5 females.

Why Opt for a 75-Gallon Tank for Your Angelfish?

Choosing a 75-gallon tank for your angelfish is an excellent decision because of its perfect balance of size and manageability.

It presents numerous benefits tailored to the needs and behaviors of angelfish.

  • Versatile Aquascaping: This volume allows for diverse aquascaping, making it possible to craft intricate landscapes that mimic the Amazon riverbeds where angelfish originate.
  • Social Dynamics Exploration: The tank size permits the introduction of other compatible species, enabling you to observe multifaceted social dynamics and interspecies interactions.
  • Safety Net for Beginners: Mistakes in water chemistry have a diluted impact in larger tanks, giving beginners a buffer and more time to rectify errors.
  • Equipment Efficiency: Larger tanks like the 75-gallon can better accommodate advanced filtration and heating systems, ensuring cleaner water and consistent temperatures.

Tips for Caring for Angelfish in a 75-Gallon Setting

Caring for angelfish in a 75-gallon environment allows them to showcase their grandeur and grace. With a strategic approach, you can ensure they lead healthy, fulfilling lives.

  • Water Parameters: Aim for a pH of 6.8 and a temperature of 78°F, closely matching Amazonian waters where they’re native.
  • Regular Filtration: Use filters rated for at least 75 gallons; for instance, a canister filter ensures effective water circulation and waste capture. I found the Fluval C4 Power Filter (link to Amazon) to be extremely useful.
  • Balanced Diet: Rotate between high-quality flakes, bloodworms, and daphnia, feeding them once or twice daily in moderate amounts.
  • Routine Maintenance: Every two weeks, siphon out 20 gallons, replacing it with dechlorinated water to refresh the tank’s chemistry.
  • Monitoring Tankmates: Suitable companions include Corydoras or tetras; avoid known fin-nippers like certain barbs.
  • Disease Vigilance: Quarantine new fish for 2 weeks before introducing them, mitigating potential disease outbreaks.
  • Provide Vertical Plants: Incorporate plants like Java Fern; they reach up to 13 inches, perfect for angelfish to weave through and spawn on.

How Many Gallons Are Needed Per Additional Angelfish?

For each additional angelfish you wish to add to your aquarium, you should allocate about 10 gallons of water.

This ensures they have sufficient space to swim, grow, and interact without stress.

  • Growth Potential: Angelfish can reach up to 6 inches in height; thus, 10 gallons per fish guarantees ample room for their full size and fin span.
  • Territorial Behavior: While angelfish are generally peaceful, they do establish territories. Providing 10 gallons per fish reduces conflicts and territory overlaps.
  • Water Quality: More space per fish aids in water parameter stability, ensuring that waste doesn’t accumulate quickly, leading to healthier angelfish.

Can You Breed Angelfish in a 75-Gallon Tank?

Yes, you can breed angelfish in a 75-gallon tank. With the right conditions and care, a 75-gallon tank provides an ideal environment for angelfish to spawn and rear their young.

  • Choose Mature Fish: For breeding, select angelfish that are at least 8-12 months old, ensuring they’re of breeding age and size.
  • Monitor Pairing: Angelfish tend to choose their mates; observe for pair formations, especially those that stay close and show territorial behavior together.
  • Optimal Water Conditions: Aim for slightly acidic water, around a pH of 6.5-6.8, and maintain a temperature of 80°F to encourage spawning.
  • Flat Surfaces: Introduce broad-leafed plants or flat vertical surfaces, like slate, where angelfish can lay their eggs. My recommendation: AQUA Angelfish Breeding Cone (link to Amazon).
  • Nutritious Diet: Feed a protein-rich diet, including live foods like bloodworms and brine shrimp, to promote healthy egg production.
  • Isolate the Pair: If possible, provide a partition or separate the breeding pair to protect the eggs and fry from other tank inhabitants.

What’s the General Recommendation for Grouping Angelfish?

The general recommendation for grouping angelfish is to either keep them singly, in pairs, or in groups of six or more.

Keeping intermediate numbers can lead to bullying or aggression as dominance hierarchies are established.

  • Single Showcase: If you want a centerpiece fish, a solitary angelfish in a community tank can be striking, especially in tanks of 20-30 gallons.
  • Breeding Pairs: For those interested in breeding, keeping a bonded pair in a separate tank ensures safety for eggs and fry.
  • School Dynamics: In larger tanks (55 gallons and up), a group of six or more angelfish will distribute aggression, allowing natural social behaviors to emerge.
  • Avoiding Trios: Keeping three can result in one being singled out and bullied. It’s best to add more to dilute potential aggression.

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

Which Fish Species Pair Well with Angelfish in a 75-Gallon Setup?

In a 75-gallon setup with angelfish, it’s essential to choose tankmates that are peaceful and won’t compete aggressively with them.

Several species coexist harmoniously with angelfish, enriching the tank’s ecosystem. Here’s a simple table summarizing what I am about to discuss:

Fish CombinationNumber in 75 gallons
Angelfish + Corydoras CatfishAngelfish: 4-6, Corydoras Catfish: 10
Angelfish + Neon TetrasAngelfish: 5-7, Neon Tetras: 20-25
Angelfish + Dwarf GouramisAngelfish: 5-7, Dwarf Gouramis: 3-5
Angelfish + Rummy Nose TetrasAngelfish: 4-6, Rummy Nose Tetras: 15-20
Angelfish + Bristlenose PlecosAngelfish: 6-8, Bristlenose Plecos: 2-3
Angelfish + HatchetfishAngelfish: 5-7, Hatchetfish: 10-12
Angelfish + Black Skirt TetrasAngelfish: 5-7, Black Skirt Tetras: 12-15
  • Corydoras Catfish: Bottom dwellers that won’t bother angelfish. In 75 gallons, you can comfortably keep a group of 10.
  • Neon Tetras: Their small size and schooling behavior make them non-threatening. A school of 20-25 would be ideal without overcrowding.
  • Dwarf Gouramis: Peaceful surface dwellers. A group of 3-5 works well in this setup, offering color variety.
  • Rummy Nose Tetras: Recognized for their tight schooling behavior, a group of 15-20 complements angelfish gracefully.
  • Bristlenose Plecos: These algae eaters stick to tank walls and decor. Two to three in a 75-gallon tank would be fitting.
  • Hatchetfish: Surface swimmers that add activity at the top. A group of 10-12 can coexist peacefully with angelfish.
  • Black Skirt Tetras: Larger tetras that won’t be intimidated. Keeping 12-15 with angelfish in 75 gallons would be harmonious.
Corydoras Catfish

Which Fish Should Be Avoided with Angelfish in a 75-Gallon Tank?

Angelfish, with their flowing fins and distinct personalities, can be vulnerable to certain aggressive or overly active fish.

It’s essential to avoid species that may nip at their fins or compete fiercely for territory in a 75-gallon tank.

  • Tiger Barbs: Known for their fin-nipping tendencies, they can harass and stress angelfish, especially in groups.
  • Red-Tailed Sharks: Highly territorial, a single Red-Tailed Shark can dominate a tank and chase angelfish incessantly.
  • Oscars: These cichlids grow large and can be aggressive, posing a risk to angelfish both in competition and as potential prey.
  • Convict Cichlids: They are territorial and can become aggressive, especially during breeding, making cohabitation risky.
  • Danios: Their rapid swimming and active behavior can stress angelfish, leading to health issues or increased aggression.
  • Pictus Catfish: With a penchant for fin nipping when they mature, they’re not the best tankmates for the slow-moving angelfish.
  • African Cichlids: Generally more aggressive and active, their pH and water requirements differ from angelfish, complicating compatibility.
Zebra Danio


For quick readers, here’s a short summary:

  • A 75-gallon tank can comfortably accommodate 6 to 8 angelfish, allowing for territorial behaviors and minimizing aggression.
  • It’s recommended to have a male-to-female angelfish ratio of 1:2 or 1:3 in a 75-gallon tank to reduce aggression and maximize breeding opportunities.
  • Choosing a 75-gallon tank provides a balanced environment for angelfish, allowing for diverse aquascaping, proper equipment efficiency, and observation of social dynamics.
  • When adding more angelfish, allocate about 10 gallons per fish, ensuring ample space for growth and reducing territorial disputes.
  • In a 75-gallon setup with angelfish, compatible tankmates include Corydoras Catfish, Neon Tetras, and Dwarf Gouramis, while fish like Tiger Barbs and Red-Tailed Sharks should be avoided.