Skip to content

Number of Angelfish vs Tank Gallon Size [Complete GUIDE]

The freshwater angelfish is a popular aquarium fish because of its beauty and rarity. Their varied coloration, patterning, and refined appearance make them a welcome addition to any fish tank. Keep in mind that angelfish have particular needs in terms of tank size and water quality. In this article, we will provide a detailed tutorial on how to figure out which dimension tank is best for your angelfish and how to set up their habitat properly.

Angelfish Tank Size Guide: How Many Angelfish Can You Keep in a 20-gallon Aquarium?

The size of the aquarium is a major consideration while keeping angelfish. Although a 20-gallon aquarium might appear adequate at first glance, angelfish are vigorous swimmers who can reach a full six inches in length. There should be no more than two angelfish in a 20-gallon tank to allow for adequate swimming room and maintain steady water quality.

Fish hostility and stress can be mitigated by providing hiding places and breaking up line of sight using aquarium decorations like plants, rocks, and hidden caves.

Keep in mind that in overcrowded tanks, angelfish may experience growth retardation, illness, or even death.
Ten Gallon tank is not recommended for keeping Angelfish

Factors to Consider When Determining Tank Size for Angelfish

There are a few considerations when deciding on the best tank size for your angelfish. Fish characteristics include physical dimensions, activity levels, and social interactions with other fish.

Size of the Fish

Angelfish can reach lengths of up to 6 inches, and as such, they require ample room to swim and explore. No more than one adult angelfish should be kept for every 10 gallons of water. As a result, two angelfish may live happily in a 20-gallon aquarium, whereas five can live in a 50-gallon aquarium.

Angelfish are known for their rapid growth; if their tank is too small, they may quickly overrun it. Angelfish youngsters, despite their reduced size, nevertheless have certain needs when it comes to their surroundings.

Activity Level of the Fish

Because of their high levels of activity, angelfish need large tanks. They stress easily if they can’t move around freely and enjoy discovering new things. It’s crucial to give them enough of room to swim around without feeling crowded in.

Compatibility with Other Fish Species

When an angelfish feels endangered in its region, it may become hostile toward other fish. Angelfish require a very stable water temperature and pH, therefore it’s crucial to pick tankmates that fit those criteria.

Angelfish can live in a tank with tetras, corydoras, and gouramis. Angelfish should not be kept with other fish species that are territorial or violent, such as cichlids or bettas.

Keep reading Can Angelfish Live With Guppies

Setting Up the Ideal Environment for Angelfish

After settling on a tank size that’s just right for your angelfish, it’s time to create an atmosphere that’s as close as possible to their original habitat. This includes giving them places to hide, a foraging-friendly substrate, and a clean environment in which to live.

Hiding Places

Angelfish have a reputation for being territorial and aggressive if they believe their territory is being invaded. A more natural and peaceful atmosphere can be achieved by giving them plenty of places to hide.

Your angelfish will appreciate the natural atmosphere you create with the help of live plants, pebbles, and driftwood.


while natural explorers, angelfish need a substrate that doesn’t restrict their movement while they look for food. To best simulate their natural habitat and encourage natural browsing behavior, a sandy or fine-gravel ground is advised.

Water Quality

Angelfish flourish in a certain set of water parameters. They prefer a pH range of 6.0 to 7.5, as well as a temperature range of 75 to 82 degrees Fahrenheit.

It is critical to keep water parameters consistent by making regular water changes and monitoring the tank’s water chemistry. Using a high-quality filter can also assist in maintaining.

Additional read: How to Naturally Lower PH in Aquarium

Choosing the Right Tank Size for Angelfish

Your angelfish’s size and activity level should guide your decision on the tank size. Angelfish, which may reach a length of up to 6 inches when fully grown, have large space needs.

A single angelfish requires a minimum of 20 gallons of water, and each additional fish need 10 gallons. However, fish can benefit from less antagonism if they have more room to swim in a larger tank.

Keep in mind that angelfish are slow swimmers and may not fare well in smaller tanks with faster, more active fish species.

Male to-female ratio of Anglefish in a 20 Gallon tank

An ideal male-to-female ratio for angelfish in a 20-gallon tank is 1:2, thus two females should be housed with one male. This proportion helps fish feel safe enough to create natural pair connections, which is essential for successful reproduction. Too many male fish in a tank can cause stress and fighting, which is bad for the fish’s health.

Single Anglefish in a tank

Angelfish are friendly and flourish in groups, however, an individual one can be kept in a tank. Angelfish are active and curious and like interacting with other fish. Boredom and loneliness can stress a single angelfish, affecting their health. Therefore, if you have a single angelfish, ensure the tank has many ornaments and hiding spots. For their gregarious nature, two angelfish are recommended per aquarium.

Only male anglerfish living together in the 20-gallon tank

Keeping just male angelfish in a tank might cause discrimination and enmity. Male angelfish are possessive and hostile toward other males, especially during the breeding season. Fish may fight and be injured. Maintaining a balance of male and female angelfish in a tank prevents aggression and maintains harmony. To avoid territorial behavior, keep only male angelfish and give lots of hiding places and visible barriers. Keep a mix of male and female angelfish to keep a healthy aquarium.

Breeding Angelfish

If managed properly, angelfish breeding is a rewarding hobby. Breeding requires reproducing their native habitat. This would have an acidic body of water with lots of vegetation.

Angelfish preparing to reproduce groom a smooth surface to lay their eggs on and perform courtship rituals. After laying eggs, male and female angelfish fertilize and protect themselves.

Fry can survive on their yolk sac for a few days. Feeding them newly hatched brine shrimp or micro worms improves their chances.

Angelfish breeding requires strict environmental control. Before breeding your angelfish, learn as much as possible and consult experienced aquarists.

Keeping Angelfish in a glass bowl

It is not advised to keep angelfish in a glass bowl since this can be harmful to their health. Angelfish can only flourish in conditions where they have plenty of room to swim, good water quality, and enough filtration. Fish kept in glass bowls may suffer from poor water quality and other health problems due to the bowls’ tiny size, lack of filtration and inadequate aeration. In addition, angelfish are curious, active fish that benefit from having lots of room to swim around in. This is why it’s crucial to supply your angelfish with a clean, well-maintained tank of the appropriate size.

Aquarium Decorations for Angelfish

Angelfish health may depend in part on the ornaments you use in their aquarium. Providing them with places to hide and establish territories can help keep them calm and content in their tank.

Angelfish tanks can be decorated with pebbles, driftwood, and live plants. They can also be used to create an environment that looks and feels just like the animal’s native habitat.

Some aquarium ornaments, including rocks with sharp or rough edges, can be dangerous to your angelfish. Before adding anything to the aquarium, a thorough inspection should be performed to identify and eliminate any hazards.


In conclusion, it’s important to give some thought to the specifics of caring for angelfish. There are a number of aspects to consider when taking care of these stunning fish, from picking out the right-sized tank to ensuring clean water and fitting decorations. Angelfish require special conditions in order to grow in a home aquarium, but with the right treatment, they may bring their owners much happiness and beauty. If you take the time to read up on the topic and follow the advice in this article, you’ll be able to provide a welcoming home for your angelfish and enjoy their company for years to come.

Q/A Section

Can I have two angelfish in a 10 gallon tank?

No, a 10-gallon tank is too small to house two angelfish. Angelfish may reach a maximum size of 6 inches and need at least 20 gallons of water per fish. Stress, stunted growth, and other health issues might result from keeping them in a tank that is too small.

How many gallons do you need for four angelfish?

A 55-gallon minimum is required for four adult angelfish. Angelfish may grow to a whopping 6 inches in length, so they’ll need plenty of room to swim around. Angelfish can be housed in groups, but they can be hostile toward one another, especially during breeding. Aggression can be mitigated by providing ample hiding places and clean water.

How many angelfish can fit in a 75 gallon?

A school of angelfish can live happily in a 75-gallon aquarium. Several factors determine how many angelfish can live in a 75-gallon tank, including the fish’s size, the tank’s filtration system, and the amount of aquarium decor. Generally speaking, a 75-gallon aquarium may accommodate up to six mature angelfish.

Can I keep two angelfish in a 20 gallon tank?

20 Gallon tank may accomodate only two adult angelfish.

Can one angelfish live in a 5 gallon tank?

20 Gallon tank is the smallest tank size for the accommodation of Angelfish.

How many angelfish can I put in a 150 Litre tank?

About 40 gallons of water can be stored in a tank of 150 liters. An initial 20-gallon tank capacity is suggested for two angelfish

Therefore, you can keep up to four angelfish in a tank that is 150 liters in size (about 40 US gallons).

How many gallons do you need for three angelfish?

For three angelfish, you would need a minimum of 40 gallons of water in your tank.

What is the minimum size tank for one angelfish?

20 Gallons

How many angelfish can I put in a 180 Litre tank?

In a 180 liter tank, you could keep around 4 to 6 adult angelfish comfortably.

Can angelfish live in a 4 gallon tank?

20 Gallon tank is the smallest tank size for the accommodation of Angelfish.

How many full grown angelfish can you have in a 55 gallon tank?

Maximum of 5 angelfish can accomodated in a 55-gallon tank.

Do angelfish eat smaller fish?

While angelfish tend to avoid conflict, they do have a predatory nature that could lead them to target smaller fish for consumption as they mature. Neon tetras, guppies, and other fish of a similar size have been found in their stomachs. To avoid hostility and predation, it’s best to pair tank inhabitants who are of comparable size and disposition.

Can I put goldfish with angelfish?

Keeping goldfish and angelfish together is not advised. Angelfish do better in warmer water, while goldfish are more comfortable in cooler temperatures. Additionally, the waste that goldfish create is often more problematic than that of angelfish. The slow movement of goldfish makes them an easy prey for predatory angelfish. It’s safer for both species if they’re kept apart in their own natural habitats.