How Many Angelfish In a 75 Gallon Tank (300 Liter) Should You Keep? - "File:Freshwater angelfish biodome.jpg" by mendel is licensed under CC BY-SA 1.0.
How Many Angelfish In a 75 Gallon Tank (300 Liter) Should You Keep? - "File:Freshwater angelfish biodome.jpg" by mendel is licensed under CC BY-SA 1.0.


Creating a harmonious aquatic environment for your angelfish is key to ensuring their health and happiness. Among the essential considerations is understanding how many angelfish in a 75-gallon tank (300 liters) would be ideal for their well-being. From tank setup to feeding, every aspect contributes to fostering a thriving habitat for these majestic freshwater fish.

Appearance and Behavior of Angelfish

Angelfish, scientifically known as Pterophyllum scalare, are renowned for their striking appearance and graceful demeanor. Their physical features and behavior make them a popular choice among aquarium enthusiasts.


  • Triangular Body: Angelfish have a distinctive triangular body shape, which is laterally compressed. This shape allows them to move effortlessly through the water.
  • Fins: Their fins are elongated and delicate, adding to their regal appearance. The dorsal and anal fins extend, trailing behind the body, while the pelvic fins are more fan-like.
  • Vertical Stripes: Depending on their mood or environment, angelfish display vertical stripes on their bodies. These stripes can be quite prominent and serve as a means of communication or defense.
  • Coloration: They come in various color morphs, ranging from silver to black, with shades of white, yellow, and orange. Their scales often shimmer, giving them an iridescent quality.
  • Size: Typically, angelfish grow to around 6 inches (15 centimeters) in height and 8 inches (20 centimeters) in length.


  • Peaceful Demeanor: Angelfish are generally peaceful, though they may exhibit territorial behavior during breeding or when establishing their space within the aquarium.
  • Social Creatures: They enjoy the company of their kind and often form pairs or small groups. They interact with other fish species in the tank, usually without aggression, making them compatible community fish.
  • Curious Nature: Angelfish are known for their inquisitive behavior. They might investigate their environment and explore various parts of the tank.
  • Breeding Behavior: When it comes to breeding, angelfish can be attentive parents. They select a suitable location for spawning and guard their eggs fiercely until they hatch.
  • Sensitivity to Water Quality: They are sensitive to changes in water conditions. Maintaining a stable and clean environment is crucial for their health and well-being.

Overall, angelfish are captivating creatures with their elegant appearance and intriguing behavior, making them a prized addition to many aquariums.

Tank Mates

When considering tank mates for angelfish, it’s important to keep in mind their peaceful nature, territorial tendencies during breeding, and their relatively slow swimming pace. Here are some factors to consider:

Tank Mate Considerations

  • Size Compatibility: Choose tank mates that are of similar size to avoid potential predation or intimidation issues.
  • Temperament: Opt for peaceful fish that won’t harass or stress the angelfish. Avoid aggressive or fin-nipping species.
  • Water Conditions: Ensure that tank mates share similar water parameter requirements regarding temperature, pH, and hardness.
  • Swimming Levels: Select fish that occupy different areas of the tank to utilize the space effectively. Angelfish primarily occupy the middle to upper water levels.
  • Breeding Behavior: During breeding, angelfish may become territorial. Consider separating breeding pairs or providing adequate hiding spots for other tank mates.

Good Tank Mates for Angelfish

  • Tetras: Species like neon tetras, cardinal tetras, or rummy nose tetras are peaceful and add color and activity to the tank.
  • Corydoras Catfish: Bottom-dwelling catfish like Corydoras are peaceful fish that won’t bother angelfish.
  • Gouramis: Some gourami species, such as pearl gouramis or honey gouramis, can coexist peacefully with angelfish.
  • Dwarf Cichlids: Certain species of dwarf cichlids, like German blue rams or Apistogramma, can make suitable tank mates due to their relatively peaceful nature.
  • Rainbowfish: Peaceful and colorful, rainbowfish can be good companions, especially when considering a larger tank setup.

Remember, individual fish may have unique personalities, so monitor their interactions closely when introducing new tank mates. Always have a backup plan to separate any aggressive or incompatible fish to maintain a harmonious aquarium environment.

How Many Angelfish In a 75 Gallon Tank (300 Liter) Should You Keep?

So, how many angelfish in a 75 gallon tank should you have? In a 75-gallon tank (which is around 300 liters), you can comfortably keep a small group of angelfish. However, it’s essential to consider factors such as tank decorations, filtration, and the presence of other fish.

For a 75-gallon tank, a good starting point would be a small group of about 4 to 6 angelfish. This number allows for a social dynamic among the angelfish while preventing overcrowding and territorial issues.

However, remember that individual personalities, breeding behavior, and tank layout can influence the compatibility and dynamics within the group. It’s always advisable to monitor the fish and be prepared to rearrange the tank or separate individuals if aggression becomes an issue.

Additionally, consider the tank’s filtration capacity and maintenance routine to ensure proper water quality. Overstocking can lead to increased waste production, affecting water parameters and the health of your fish.

Lastly, if you plan to keep other fish species alongside the angelfish, this may impact how many angelfish in a 75 gallon tank you can have, so you should adjust the number of angelfish accordingly to maintain a harmonious balance within the tank.

Aquarium Setup

Setting up a 75-gallon (300 liter) tank for angelfish offers ample space for these elegant fish to thrive. Here’s a detailed guide on how to set it up:

Tank Décor

  • Substrate: Use fine gravel or sand substrate. Angelfish might sift through it, so avoid sharp materials that could injure their delicate fins.
  • Plants: Incorporate live plants such as Amazon swords, Java fern, Anubias, Vallisneria, or floating plants. These offer hiding spots, cover, and mimic their natural habitat. Ensure plants are well-rooted or anchored securely.
  • Hardscape: Driftwood, rocks, or artificial caves provide hiding spots and territories. Arrange them strategically to create various levels and hiding places for the angelfish.

Filtration and Water Quality

  • Invest in a robust filtration system suitable for the tank size. A canister filter or a combination of multiple filters might be needed for efficient filtration and water circulation.

Water Conditions

  • Temperature: Maintain the water temperature between 75°F to 82°F (24°C to 28°C) to replicate their tropical habitat.
  • pH: Aim for a slightly acidic to neutral pH range, around 6.5 to 7.5.


  • Use subdued lighting with LED lights or floating plants to provide shaded areas. Angelfish prefer dimmer lighting conditions mimicking the dappled light in their natural habitat.

Tank Mates:

  • Choose compatible tank mates that won’t stress or harass the angelfish. See the earlier section on this.


  • Establish a regular maintenance routine including water changes (about 25-30% every two weeks), cleaning the tank, trimming plants, and monitoring water parameters to keep the environment healthy.

By following these guidelines and customizing the setup to cater to the specific needs of angelfish, you can create an enriching and thriving habitat for these graceful freshwater fish in a 75-gallon tank (300 liters).

How Many Angelfish In a 75 Gallon Tank (300 Liter) Should You Keep? - "File:Freshwater angelfish biodome.jpg" by mendel is licensed under CC BY-SA 1.0.
How Many Angelfish In a 75 Gallon Tank (300 Liter) Should You Keep? – “File:Freshwater angelfish biodome.jpg” by mendel is licensed under CC BY-SA 1.0.


Feeding angelfish a balanced diet is crucial for their health and vitality. Here are some guidelines for feeding angelfish:


  • Variety: Offer a diverse diet comprising high-quality flakes, pellets, and frozen or live foods. This variety ensures they receive essential nutrients and vitamins.
  • Flakes/Pellets: Choose high-quality flakes or pellets specifically formulated for tropical fish. Look for options that contain a balanced mix of proteins, vitamins, and minerals.
  • Frozen/Live Foods: Supplement their diet with live or frozen foods like bloodworms, brine shrimp, daphnia, or tubifex worms. These foods replicate their natural diet and provide essential proteins.

Feeding Schedule

  • Regular Feeding: Feed them small amounts 2-3 times a day, providing only what they can consume in a couple of minutes. Overfeeding can lead to health issues and water quality problems.
  • Observation: Monitor their feeding behavior. If any fish consistently doesn’t get its share of food, consider feeding in multiple spots or at different times to ensure all fish are adequately fed.


  • Variation: Introduce variety in their diet to prevent nutritional deficiencies. Rotating between different types of food helps maintain their interest and provides a well-rounded diet.
  • Avoid Overfeeding: Angelfish have a tendency to eat beyond their capacity. Uneaten food can deteriorate water quality. Feed them moderate amounts to prevent overeating.
  • Supplementation for Breeding: When angelfish are breeding, consider providing them with additional protein-rich foods to support their increased energy requirements.


  • Before introducing live foods, ensure they come from a reputable source to prevent the introduction of parasites or diseases into the tank.
  • Consider offering vegetables like blanched spinach or zucchini for fiber and additional nutrients. Some angelfish may enjoy nibbling on these.

By maintaining a balanced and varied diet, you can ensure the overall health and vibrancy of your angelfish, supporting their growth and well-being within the aquarium environment.


Determining how many angelfish in a 75-gallon tank (300 liters) to keep involves balancing space, compatibility, and environmental factors. By providing ample room for swimming, suitable tank mates, a well-decorated habitat with plants and hiding spots, and a balanced diet, you can create an optimal setting for these graceful fish. Regular maintenance and attention to their needs ensure a healthy and vibrant community, allowing your angelfish to flourish in their aquatic home.