How many angelfish can be kept in a tank?

The number of angelfish you can keep in a tank depends on the tank's size and other factors.

For a standard 20-gallon tank, it's generally recommended to have 1 or 2 angelfish. Due to their territorial behavior and potential aggression.

In a larger tank, like 55 gallons, you might be able to keep a small group of 3-4 angelfish. It's important to consider factors like tank dimensions, water quality, and compatibility with other fish species when determining the stocking level. Overcrowding can lead to stress, disease, and aggression among the fish. Always research and plan accordingly to provide a healthy and comfortable environment for your angelfish.

Angelfish can coexist in groups and their territorial behavior can lead to aggression, especially in smaller tanks. Providing hiding spots, plants, and visual barriers can help reduce conflicts.

The following are recommended tank sizes for your angelfish -

30-gallon tank 2 angelfish are better suited for a 2 Angelfish due to space constraints.
40-gallon tank 2 to 3 angelfish are ensured with plenty of hiding spots and visual barriers.
55-gallon tank 3 to 4 angelfish, provide adequate swimming space and territories.
75-gallon tanks 5 to 6 angelfish are best, consider a mix of colors and patterns for variety.
125-gallon tanks 8 to 10 angelfish are recommended, providing multiple hiding spots and territories.

For a tank size of at least 20 gallons for a single angelfish for a group, consider a tank that's 55 gallons or larger. The temperature should be 75-82° F(24-28°C), pH 6.5- 7.5, hardness 3-8 dGH.
Compatibility peaceful community fish like tetras, rasboras, corydoras, and some peaceful bottom dwellers. Avoid aggressive or fin-nipping fish.

A 30-gallon tank is suitable for one dwarf angelfish, but larger tanks are better for a community setup. Temperature 75- 80°(24- 27°C), pH 8.1- 8.4. Compatibility peaceful reef- safe fish that share similar water parameters, avoid larger or aggressive fish.

Basic requirements for Angelfish tank

Similar water parameters, Tankmates should share similar temperatures, pH, and hardness requirements. Avoid mixing fish with vastly different needs.
Non-aggressive tank mates, choose peaceful and non-fin-nipping fish as tank mates to minimize stress and aggression.
Size compatibility, avoid mixing significantly larger or smaller fish, as size differences can lead to territorial disputes.
Habitat and behavior, consider fish with similar behavior and habitat preferences to reduce stress and competition.
Avoid Aggressive species, and stay away from aggressive or territorial fish that could bully or stress out the angelfish.
Gender balance if keeping a group, maintains a balanced ratio of males and females to minimize aggression.