Angelfish Care Guide — Tank Setup, Feeding and Breeding

Introduction

Few freshwater fish carry the same instant recognition as the angelfish. With its tall, compressed body, long trailing fins, and slow, deliberate movements, Pterophyllum scalare has been a centrepiece of home aquariums for well over a century. It was one of the first tropical fish bred in captivity, and its popularity has never really faded. Walk into any aquarium shop in the world and you will find angelfish, usually in several colour varieties, gliding quietly through display tanks, catching the eye of beginners and experienced keepers alike.

What draws people to angelfish goes beyond looks, though the looks certainly help. These are fish with genuine personality. They learn to recognise the person who feeds them, often rushing to the front glass at mealtime. They interact with one another in ways that are easy to observe and genuinely interesting, forming pair bonds, establishing subtle hierarchies, and sometimes engaging in territorial disputes that, while rarely harmful, add a layer of drama to any community tank. They occupy a sweet spot between “easy enough to keep” and “complex enough to stay interesting,” which is probably why so many fishkeepers who start with angelfish never stop keeping them.

Angelfish are well suited to intermediate keepers, though a thoughtful beginner with a properly cycled tank of adequate size can absolutely succeed with them. They do need more vertical space than many common community fish, and they are cichlids, which means their temperament is a notch above the average tetra. If you are willing to provide a tall tank, stable water parameters, and a bit of attention to tank mate selection, angelfish will reward you with years of elegant, engaging company.

Quick stats

Scientific name	Pterophyllum scalare
Family	Cichlidae
Origin	Amazon River basin, South America
Adult size	15 cm body length, up to 20 cm tall including fins
Lifespan	10–12 years
Difficulty	Intermediate
Breeding difficulty	Moderate
Temperature	24–28 °C
pH range	6.0–7.5
Minimum tank size	200 litres

Appearance

The angelfish body plan is unmistakable. The body is laterally compressed, almost disc-like when viewed from the side, and framed by dramatically elongated dorsal and anal fins that give the fish its characteristic diamond or arrowhead silhouette. The pelvic fins extend into long, thread-like filaments that trail behind the fish as it moves. Wild-type angelfish are silver with four to five dark vertical bars that can intensify or fade depending on mood, stress, and lighting. Captive breeding has produced a staggering range of colour morphs: marble, koi, gold, platinum, black, blue, ghost, leopard, and many more. Veil-tail and super veil variants carry even longer, more flowing finnage.

Sexing angelfish outside of spawning season is notoriously tricky, even for experienced keepers. Males tend to develop a slightly more pronounced nuchal hump on the forehead as they mature, and their bodies may appear a touch more angular at the head. The most reliable method is examining the breeding tubes, which become visible just before spawning. The female’s ovipositor is broader and more blunt, while the male’s papilla is narrower and more pointed. In practice, many keepers buy a group of six juveniles and allow pairs to form naturally, you will know a pair has formed when two fish begin defending a flat surface together.

Natural habitat

Wild Pterophyllum scalare inhabit the slow-moving tributaries, floodplain lakes, and flooded forests of the Amazon River basin, primarily in Peru, Colombia, and Brazil. These are warm, soft, often tannin-stained waters where fallen branches, submerged tree roots, and dense aquatic vegetation create a complex vertical environment. The water is typically acidic, with pH values ranging from 6.0 to 6.8, and quite soft. Light levels are subdued, filtered through the canopy overhead and darkened by dissolved organic compounds. The vertical structure of their habitat, tall plants, standing roots, overhanging branches, explains why angelfish have evolved that tall, compressed body shape. It allows them to slip between vertical obstacles with ease.

Understanding this habitat is the key to setting up a tank that lets angelfish thrive rather than merely survive. Warm water, gentle flow, plenty of vertical cover, and subdued lighting all mirror the conditions these fish evolved in. You do not need to replicate an Amazonian blackwater biotope perfectly, but keeping the broad principles in mind will go a long way. Fish that feel secure in their environment show better colour, more natural behaviour, and greater resistance to disease.

Tank size and setup

A single pair of angelfish needs a minimum of 200 litres, and a group of four to six should be housed in 300 litres or more. Tank height matters as much as volume here. Look for tanks at least 45 cm tall, and ideally 50 cm or more. Standard long-and-low tanks designed for schooling fish are not ideal for a species that grows 20 cm from dorsal tip to anal fin tip. A 200-litre tall-format tank, roughly 100 × 40 × 50 cm, is a sensible starting point for a pair.

For substrate, fine sand works best and looks most natural. Pool filter sand and commercially available aquarium sands like JBL Sansibar or CaribSea Super Naturals are all good choices. Angelfish do not dig extensively, but they appreciate being able to pick food off a smooth surface rather than having it fall between coarse gravel particles.

Plants are important, both for aesthetics and for giving angelfish the vertical cover they feel most comfortable around. Amazon swords (Echinodorus bleheri) are the classic pairing, they grow tall, provide broad leaves that angelfish often choose as spawning sites, and tolerate the same water parameters. Vallisneria spiralis adds height in the background. Java fern (Microsorum pteropus) and Anubias barteri can be attached to driftwood and rocks for mid-level interest without needing to be rooted in substrate. Floating plants like Amazon frogbit (Limnobium laevigatum) help soften the light and add overhead cover.

Add a few pieces of branching driftwood, Malaysian driftwood or spider wood both work well, arranged vertically to mimic submerged roots. Leave open swimming space in the centre and front of the tank. Lighting should be moderate; if you are growing plants, an adjustable LED like the Fluval Plant 3.0 or Chihiros WRGB lets you dial intensity back to a level that keeps plants healthy without making the fish feel exposed. Water flow should be gentle. Angelfish are not strong swimmers, and excessive current will stress them and damage their finnage over time.

Water parameters

Temperature	24–28 °C (ideal: 26 °C)
pH	6.0–7.5
General hardness (GH)	3–10 dGH
Carbonate hardness (KH)	3–8 dKH
Ammonia	0 ppm
Nitrite	0 ppm
Nitrate	Below 20 ppm

Stability matters more than hitting the exact middle of each range. An angelfish kept at a steady pH of 7.2 in moderately hard tap water will do far better than one subjected to frequent chemical adjustments chasing 6.5. That said, if you plan to breed, softer and slightly acidic water, around pH 6.5 and 4–6 dGH, does noticeably improve egg fertility and hatch rates. Weekly water changes of 25–30 percent are the most effective way to keep nitrates low and water quality high. Use a dechlorinator like Seachem Prime with every change.

Filtration and equipment

An external canister filter is the best choice for an angelfish tank. It provides strong biological filtration without generating excessive flow inside the tank, especially if you fit a spray bar or lily pipe to diffuse the output. For a 200–300 litre setup, something in the range of the Fluval 307, Eheim Classic 350, or Oase BioMaster 350 will handle the bioload comfortably. If you prefer a hang-on-back filter for simplicity, look at the Seachem Tidal 55 or AquaClear 70, and position the outflow so it does not create a strong current across the tank.

Angelfish are tropical fish and need a reliable heater. An adjustable heater rated for your tank volume, roughly 1 watt per litre, is standard. The Eheim Jäger or Fluval E-series are both trusted options with accurate thermostats. Always pair your heater with a separate thermometer to verify the temperature independently. A digital thermometer with a probe, or even a simple glass stick-on model, is fine.

A liquid water testing kit is essential. The API Freshwater Master Test Kit covers ammonia, nitrite, nitrate, and pH and will last hundreds of tests. Avoid paper test strips, they are less accurate and more expensive per test in the long run. Test weekly during normal maintenance and daily when cycling a new tank or treating illness.

Diet and feeding

In the wild, angelfish are opportunistic omnivores that feed on small invertebrates, insect larvae, zooplankton, and occasionally plant matter and algae. They are not fussy eaters in captivity, which makes feeding them straightforward, but a varied diet produces the best colour, growth, and overall health.

A high-quality flake or slow-sinking pellet should form the staple. Hikari Cichlid Bio-Gold, Northfin Cichlid Formula, and New Life Spectrum Cichlid pellets are all well-regarded options. Supplement two to three times per week with frozen foods: bloodworms, brine shrimp, daphnia, and mysis shrimp all go down very well. Live foods like brine shrimp and blackworms are excellent for conditioning breeding pairs. Blanched vegetables such as shelled peas or zucchini rounds can be offered occasionally for fibre, though angelfish are less enthusiastic about greens than some cichlids.

Feed once or twice a day, offering only what the fish can consume in about two minutes. Angelfish will eagerly overeat if given the opportunity, and overfeeding is one of the fastest routes to poor water quality and health problems. Young, growing juveniles benefit from two smaller feedings per day; adults can do perfectly well with one.

Behaviour and temperament

Angelfish are cichlids, and they behave like cichlids, which is to say they are more intelligent, more aware, and more territorial than your average community fish. During day-to-day life, they tend to cruise slowly through the middle and upper portions of the tank, occasionally pausing among plants or near driftwood. They are not hyperactive swimmers. Much of their charm comes from their composed, almost stately movement and the way they seem to watch what is happening around them.

Within their own species, angelfish establish a pecking order. In a group, a dominant pair will typically emerge and may chase subordinates away from preferred areas of the tank, especially during spawning. This behaviour is normal and rarely results in real harm, provided the tank is large enough and has enough visual barriers to break lines of sight. Keeping a single angelfish is fine; keeping two is often problematic unless they are a bonded pair, because one will usually bully the other. Groups of five or six work well, as aggression is spread out and no single fish bears the brunt of it.

One quirk worth mentioning: angelfish can be surprisingly predatory toward very small fish. Anything small enough to fit in an angelfish’s mouth is likely to end up there. Adult angelfish have been known to eat neon tetras, small rasboras, and newborn fry of any species. This is not aggression, it is just the natural behaviour of a mid-sized omnivorous cichlid. Keep this in mind when choosing tank mates.

Tank mates

Good tank mates

Corydoras catfish, peaceful bottom dwellers that occupy a different zone of the tank and leave angelfish alone entirely.
Bristlenose pleco (Ancistrus sp.), a calm, algae-eating catfish that stays out of the angelfish’s way.
Rummy-nose tetra, large enough to avoid predation, peaceful, and a natural Amazonian companion.
Cardinal tetra, a classic pairing, though only with adults that have been raised alongside them. Very small cardinals may be eaten.
Kribensis, a smaller cichlid that generally coexists well, provided both species have adequate territory.
Pearl gourami, calm, similarly sized, and compatible in temperament and water parameters.
Dwarf gourami, peaceful and occupies the upper water column; a good fit for tanks 250 litres and above.
Bolivian ram, a gentle dwarf cichlid that shares the same temperature and pH requirements.
Cherry barb, peaceful, colourful, and large enough not to become a meal.

Fish to avoid

Tiger barb, notorious fin nippers that will shred angelfish fins relentlessly.
Serpae tetra, another fin nipper, especially in smaller groups.
Neon tetra, often too small and will be eaten by adult angelfish, despite being frequently recommended together.
Oscar, far too large and aggressive; will harass or eat angelfish.
Convict cichlid, highly aggressive, especially when breeding, and will dominate angelfish.
Chinese algae eater, becomes aggressive and territorial as it matures and may latch onto angelfish flanks.
Betta, the long fins of both species lead to mutual aggression and stress in most setups.
Any very small fish (endlers, microrasboras, small shrimp), angelfish will treat these as food.

Breeding

Breeding angelfish is one of the most rewarding experiences in the freshwater hobby and is well within reach of keepers with a bit of patience. The first step is obtaining a bonded pair. As mentioned earlier, the easiest way to do this is to raise a group of six juveniles together and allow pairs to form naturally over several months. You will know a pair has bonded when two fish begin cleaning a flat vertical surface, a broad leaf, a piece of slate, or even the side of a filter intake, and aggressively chasing other fish away from the area.

To condition a pair for spawning, increase the proportion of high-protein foods like frozen bloodworms and live brine shrimp for one to two weeks. A slightly larger water change with water a degree or two cooler than the tank can sometimes trigger spawning, mimicking the onset of the rainy season in their native habitat. Softening the water to around 4–6 dGH and lowering pH to 6.5 can improve fertilisation rates, but many pairs will spawn successfully in moderately hard tap water.

The female deposits rows of eggs on the chosen surface, and the male follows immediately to fertilise them. A typical clutch contains 200 to 400 eggs. Both parents guard the eggs and fan them to maintain water flow, removing any that turn white with fungus. Eggs hatch in roughly 48 to 60 hours at 27 °C, and the wrigglers remain attached to the spawning site for another few days, absorbing their yolk sacs. Once free-swimming, usually around day five to seven, the fry can be fed freshly hatched baby brine shrimp (Artemia nauplii) or a commercial liquid fry food like Hikari First Bites. Feed small amounts several times a day and keep the water pristine with frequent partial water changes.

Some pairs are excellent parents and will guard their fry for weeks. Others, especially first-time spawners, may eat the eggs or fry. If you want to maximise survival, you can remove the spawning slate and eggs to a separate hatching tank with gentle aeration and a few drops of methylene blue to prevent fungus. After two to three weeks on baby brine shrimp, fry can be transitioned to finely crushed flake or micro pellets.

Common diseases and health

Ich (white spot disease)

Ich is caused by the parasite Ichthyophthirius multifiliis and appears as small white spots scattered across the body and fins, often accompanied by flashing (scratching against objects) and clamped fins. It is usually triggered by temperature fluctuations or the introduction of untreated new fish. Treatment involves gradually raising the temperature to 30 °C over 24–48 hours, which accelerates the parasite’s life cycle, combined with a medication containing malachite green or formalin. Seachem ParaGuard and API Super Ick Cure are both commonly used. Maintain the elevated temperature for at least ten days to ensure the full life cycle is broken.

Angelfish virus (Pterophyllum iridovirus)

This viral infection is specific to angelfish and unfortunately quite common in commercially bred stock. Symptoms include lethargy, excess mucus production, rapid breathing, and sometimes sudden death in apparently healthy fish. There is no cure, treatment is supportive only, focusing on pristine water quality, reduced stress, and good nutrition to help the fish’s immune system fight the virus. Mortality can be high. The best defence is prevention: buy from reputable breeders, quarantine all new fish for at least two to four weeks before adding them to your main tank, and avoid impulse purchases of fish that look even slightly unwell.

Fin rot

Fin rot is a bacterial infection that causes the edges of the fins to become ragged, discoloured, or milky. It is almost always secondary to poor water quality, stress, or injury from fin-nipping tank mates. The first step in treatment is identifying and correcting the underlying cause, perform a large water change, test your parameters, and remove any aggressive tank mates. Mild cases often resolve with improved water quality alone. More advanced infections may require treatment with an antibacterial medication like API Melafix for mild cases, or a broad-spectrum antibiotic like Seachem Kanaplex for severe ones.

A note on quarantining: every new fish you bring home should spend a minimum of two weeks, ideally four, in a separate quarantine tank before joining your display tank. This applies to angelfish more than most species because of their susceptibility to the angelfish virus and their sensitivity to ich. A simple 50–70 litre tank with a sponge filter, a heater, and a hiding spot is all you need. This one habit will save you more heartbreak than any medication ever could.

Frequently asked questions

How many angelfish should I keep together?

A single angelfish does fine on its own, and a bonded pair is a wonderful combination. If you want a group, aim for five or six in a tank of 300 litres or more. Avoid keeping just two or three unless they are a confirmed pair, as a dominant fish will often bully a single subordinate with no one else to spread the aggression among.

Can angelfish live with neon tetras?

This is one of the most common questions in the hobby, and the honest answer is: usually not for long. Neon tetras are small enough to be eaten by adult angelfish, and most keepers who try this combination eventually find their neon population dwindling. Larger tetras like rummy-nose or Congo tetras are much safer choices.

Why are my angelfish fighting?

Some degree of sparring is normal, especially as young fish mature and establish a hierarchy. It becomes a problem if one fish is being relentlessly chased, showing clamped fins, hiding constantly, or developing torn fins. If that happens, consider adding more visual barriers with plants and driftwood, increasing the group size to spread aggression, or rehoming the aggressor or victim.

How big do angelfish actually get?

A healthy adult angelfish will reach about 15 cm in body length and can stand 20 cm or more from dorsal to anal fin tip. They grow relatively quickly in their first year and reach full size by around 18 months. This is a larger fish than many beginners expect, which is why a tall tank of at least 200 litres is so important.

How long do angelfish live?

With good care, angelfish commonly live 10 to 12 years in captivity. Some keepers report fish reaching 15 years, though this is exceptional. Lifespan is heavily influenced by water quality, diet, genetics, and stress levels. Fish from reputable breeders who prioritise health over extreme colour morphs tend to be more robust and longer-lived.