Pterophyllum scalare

Freshwater Angelfish

Angelfish are elegant, deep-bodied cichlids that reward a tall, well-planted tank with striking display behaviour, but their territorial streak means tankmates need careful choosing.

CichlidaeLifespan 10 years or more in well-kept tanksCare complexity 3/5Not a beginner animal

Freshwater Angelfish in a suitable home habitat

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At a glance

Scientific name: Pterophyllum scalare
Family: Cichlidae
Origin: Amazon river basin of South America
Lifespan: 10 years or more in well-kept tanks
Adult size: 15 cm long, up to 25 cm tall including fins
Weight: Not typically measured
Temperament: Semi-aggressive, territorial once paired, calmer in groups when young
Activity level: Moderate; graceful mid-water swimmers
Social needs: Best kept in a group of five or six juveniles or as an established pair
Intelligence: Recognises its keeper and can learn feeding routines
Noise: Silent

Housing and environment

Housing: Minimum 150 litre tall tank, taller than 45 cm to suit their body shape
Space requirement: Tall planted tank with open swimming columns and vertical driftwood or plants
Temperature: 24–29°C
Humidity: Not applicable
Exercise: Provided by tank size and tall décor to swim through
Grooming: Not applicable; fin condition reflects water quality

Life stages and changing needs

Expanded care guidance · Updated 7 October 2026 · Not professionally reviewed

Young animals and settling in

Juvenile angelfish and other similar cichlids are usually sold as a small group and are relatively tolerant of each other at this stage, but that peaceful arrangement is temporary. Set up a tall, fully cycled tank with vertical decor before the fish arrive, since this body shape needs height as much as floor space, and plan from the outset for pairs to form and establish territory as the fish mature.

Adult care and reproductive changes

As angelfish mature, pairs typically form and become territorial, defending a chosen spawning site and driving away other tankmates, including fish they previously tolerated. This is normal reproductive behaviour, not a sign that something has gone wrong, but it can seriously injure smaller or slower tankmates if the tank is too small to offer an escape route. Keep a close eye on new pairings and be ready to rehome or separate fish that are being persistently targeted.

Later life and changing needs

A well-kept angelfish can live a decade or more, and an older fish should still show an upright body shape, steady swimming and a normal appetite. Clamped fins, a hollow belly, laboured breathing or a loss of the fish's usual position in its established territory suggests illness rather than simple ageing, and warrants water testing alongside a veterinary or experienced aquatic professional opinion.

Diet and feeding

Omnivorous: quality pellets or flake plus live or frozen bloodworm and brine shrimp

Feed a varied omnivorous diet of good-quality pellets or flake formulated for cichlids, supplemented with live or frozen foods such as bloodworm and brine shrimp for enrichment and condition. A single food type long-term can lead to nutritional gaps, particularly for a species that forages opportunistically on a wide range of foods in the wild.

Feed amounts that are cleared within a couple of minutes, once or twice daily, and watch for a dominant fish monopolising food at the expense of a subordinate or newly introduced tankmate. Persistent poor condition in one fish despite an apparently well-fed tank points to bullying or stress rather than a feeding problem alone.

Daily care and ongoing checks

Every day

Check filtration, temperature and the behaviour of each fish daily, paying particular attention to fin condition and whether any individual is being chased away from food or shelter. A tall tank with dense planting or driftwood gives subordinate fish and tankmates genuine places to retreat from a territorial pair.

Regular maintenance and prevention

Carry out regular partial water changes guided by test results, since angelfish are sensitive to poor water quality and ammonia spikes can cause rapid deterioration. Quarantine new fish before introducing them to an established group, and avoid adding slow-moving, long-finned species that can be targeted by fin-nipping or territorial aggression.

Behaviour and compatibility

Pair formation, territory defence around spawning sites, slow deliberate swimming

With children: Good display fish for children to observe, not handle
With other animals: Can be fin-nippy toward slow, long-finned tankmates; avoid small tetras
Training difficulty: Not applicable

Health

Hole-in-the-head disease
Ich
Fin rot from poor water quality
Bloat
Aggression injuries between pairs

Aquatic vets are rare; a knowledgeable fish supplier and careful water testing substitute in most regions

Special care requirements

Sudden pairing aggression can seriously injure other fish; watch new groups closely

Tall tank design and pair territoriality

Angelfish need a tall tank, at least 150 litres and taller than 45 centimetres, to suit their deep body shape and natural vertical swimming behaviour; a standard long, shallow community tank does not give them the space their body shape and territorial habits actually need.

As juveniles mature into established pairs, expect genuine territorial aggression around a chosen spawning site, which can seriously injure slower or long-finned tankmates in an undersized tank; avoid housing angelfish with small tetras or other easily targeted species, and watch new pairings closely for one-sided harassment.

Before you take one on

Sources and further guidance

These welfare and veterinary resources inform general husbandry advice; they do not certify this profile or replace a species-experienced professional. Confirm exact environmental settings and feeding plans for your animal.

RSPCA: caring for pet fish

Can your home meet freshwater angelfish needs?

Plan for a lifespan of 10 years or more in well-kept tanks, including holiday cover and, where one is available, a vet familiar with this species. Lifespan ranges are not guarantees.
Arrange the social setting before arrival. Social guidance for this species: Best kept in a group of five or six juveniles or as an established pair. Do not assume another animal of any species is a suitable companion.
Habitat priority for this species: Tall planted tank with open swimming columns and vertical driftwood or plants. Make sure your setup can provide this consistently. Check temperature and water quality with a thermometer and test kits rather than guessing.
Key care point: Sudden pairing aggression can seriously injure other fish; watch new groups closely. Discuss diet and any specialist needs with the supplier, rescue and a vet who treats this species, and check local legal requirements before acquiring an animal.

Educational reference, not an individual diagnosis or a verified professional review. Read our editorial policy.

Guidance libraries and further reading

These organisations publish relevant guidance. Their links are further reading, not evidence that they have reviewed this page.

RSPCA — animal care and welfare advice across species
PDSA — veterinary charity pet health advice
AVMA — American Veterinary Medical Association owner resources