Freshwater Angelfish Care Guide

The freshwater angelfish (Pterophyllum scalare) is a tall-bodied Amazonian cichlid sold as a peaceful community fish. In truth it is a slow, semi-aggressive ambush predator that needs height as much as gallons and will eat any fish small enough to fit its mouth.

Freshwater Angelfish at a glance

The sourced figures the welfare engine uses to judge Freshwater Angelfish — the parseable key facts.

Where it comes from

Native to the Amazon basin across Peru, Colombia and Brazil, angelfish live in slow or still clear-to-silty water among dense submerged vegetation, drowned roots and branches. That biotope explains the care. The tall, laterally-compressed body evolved to slip vertically between roots and tall plant stems, so the tank must be tall and furnished with vertical structure, not open and shallow. The still-water origin means low flow — strong powerheads stress them and shred their fins. Their soft, slightly acidic home water (about pH 6–7, 3–10 °dH, 26–30 °C) is what they spawn best in, even though they tolerate a wider range for everyday keeping.

Did you know?

• Taller than it is long — up to about 20 cm (8 in) tall with fins versus roughly 15 cm (6 in) of body — which is why tank height, not gallons, sets the requirement.
• A wolf in angel's clothing: marketed as a peaceful community fish, its wild diet is fish fry, shrimp and insects, and 'few livebearer fry survive' alongside one.
• Devoted cichlid parents — mother and father both fan and guard the eggs and shepherd the free-swimming fry.
• The veil and superveil fin strains are the product of 40-plus years of selective breeding; wild silver angels are now rare in the trade.
• The angelfish genome was sequenced in 2022 by a high-school student, Indeever Madireddy.

Tank size — and why

Height, not volume, is the binding constraint. The body reaches about 15 cm (6 in) long, but with the dorsal and anal fins fully extended the fish stands around 20 cm (8 in) or more tall — taller than it is long. A single adult needs a 20-gallon 'high' minimum; 29 gallons is the usual community floor for up to four adults; a group of five or six wants 55 gallons or more. Whatever the gallons, the tank should be at least roughly 45–50 cm tall, or mature angels cannot fully extend their fins. A long, shallow 'breeder' tank is wrong for adults even when the volume technically matches.

As a guide, a 29-gallon tank comfortably suits about 1 Freshwater Angelfish as a single-species display, leaving room for tankmates.

More on numbers by tank size: How many Freshwater Angelfish in a 29-gallon tank? · How many Freshwater Angelfish in a 40-gallon tank? · How many Freshwater Angelfish in a 55-gallon tank?

Water parameters in practice

Angelfish are adaptable for keeping: pH anywhere from about 6.0 to 8.0 and hardness from soft to medium are tolerated, though soft and slightly acidic (around pH 6.5–7) is preferred, and breeding hatch rates climb in soft, acidic water. Keep them warm — 26–30 °C (about 78–86 °F) is ideal, tolerating down to roughly 24 °C, with around 82 °F favoured for breeding. They are sensitive to ammonia and nitrite and to nitrate accumulation, so stable parameters and low nitrate matter more than hitting an exact pH number.

Diet & feeding

In the wild largely carnivorous — fish fry, small shrimp, crabs, worms, mosquito larvae and water bugs — and in the tank a voracious omnivore. A good cichlid or community pellet or flake forms the staple, supplemented generously with frozen or live bloodworms, brine shrimp, daphnia and tubifex; a varied, vitamin-rich diet helps stave off hole-in-the-head. Feed one or two small meals a day for adults, more for growing juveniles, and don't overfeed — poor water quality is the main route into disease. Remember they are adept hunters that will actively pick off small tankmates, fry and shrimp.

Gear & setup

A tall, warm, gently-filtered planted tank. Soft sand or fine gravel substrate, broadleaf plants such as Amazon sword, driftwood branches and tall stems give the security and vertical spawning sites they want. Keep flow low to mimic still Amazon backwaters; strong current stresses them and damages the long fins. Use a lid — angelfish can spook and jump.

Temperament & behaviour

A semi-aggressive cichlid, 'tame for a cichlid' but with a highly predacious nature — a patient ambush predator with vulnerable long fins, so both predator and potential victim depending on its tankmates. A bonded pair preparing to spawn clears a territory and drives off everything nearby, including former friends and sometimes its own partner; that is normal cichlid breeding behaviour, not illness.

Group & social needs

The numbers are counter-intuitive: keep one, or a group of five or six — but avoid two to four. A single angelfish does fine alone. In a group of five-plus a hierarchy forms, but aggression is spread across many fish so no individual takes the brunt. In just two or three, a dominant fish concentrates all its bullying on one subordinate, which hides, stops eating and can be killed. Buy a group young, grow them out, and expect to rehome some as pairs form.

Compatible tank mates (preview)

A short, engine-cleared shortlist — the species TankStocking's welfare engine clears with Freshwater Angelfish and that suit its size and temperament best. Tap any to load the pairing in the planner.

• Bamboo Shrimp (Wood/Fan Shrimp) — Peaceful temperament, similar adult size, not a fin-nipper.
• Boesemani Rainbowfish — Peaceful temperament, similar adult size, not a fin-nipper.
• Bolivian Ram — Uses the bottom zone, peaceful temperament, similar adult size, not a fin-nipper.

One caveat on the shrimp and snails here: engine-cleared means a size, temperament and water-needs fit — it is not a guarantee of safety. An individual Freshwater Angelfish may still hunt shrimp or pick at small snails, and temperament varies from fish to fish, so add invertebrates cautiously, give them cover, and watch the first encounters.

See the full Freshwater Angelfish tank mates guide →

Breeding & sexing

Sexing is hard outside breeding — they are monomorphic, and the only reliable tell is the genital papilla when spawning: a thin, pointed tube on the male, a thicker, blunt ovipositor on the female. They pair off from a group on their own; you cannot reliably force two adults together. They are vertical spawners needing a surface at least about 15 cm tall (broadleaf plant, slate, pipe or cone), triggered by warmth, soft acidic water and conditioning on live foods. Clutches reach up to roughly 1000 eggs, hatching in two to three days; both parents fan and guard eggs and fry with classic cichlid devotion, though first-time parents commonly eat their early spawns before learning. Getting spawns is easy-to-intermediate; rearing fry is the hard part.

Lifespan

Typically 8–12 years with good care, and 15 or more reported with excellent water, diet and genetics. The common 'they only live 2–3 years' reports usually trace to small tanks, bad water and persistently high nitrate weakening immunity, not to the species itself.

Common mistakes

• Buying a short, long 'breeder' tank because the gallons match — it fails the height requirement and adults cannot extend their fins; don't buy if your tank is under about 45 cm tall.
• Adding them to a neon, ember or shrimp nano community — the neon-tetra predation trap: it looks fine for months, then the grown angelfish eats the small fish one by one, often at night.
• Keeping exactly two to four, which concentrates bullying on one fish; keep one, a group of five or six, or a known bonded pair alone.
• Pairing them with fin-nippers like tiger or serpae barbs, which shred the long fins.
• Strong flow or a bare, bright, open tank, which leaves them stressed, skittish and fin-damaged.

Signs of trouble

• Clamped fins or rapid gilling
• Darkened or faded vertical barring
• Hiding or sitting near the substrate
• Refusing food
• Pits or sores on the head and lateral line (hole-in-the-head)

Is this fish right for you?

Don't buy an angelfish if your tank is under about 45 cm tall, if you want to keep nano fish or dwarf shrimp (it eats them), if you can only fit exactly two to four of them, or if your community already holds fin-nippers. Be cautious about stock quality: 'balloon' or 'bubble' angelfish are a deformity morph (shortened, compressed spine) linked to swim-bladder and organ problems and widely considered an ethics issue, and GMO 'GloAngel' fluorescent strains carry their own legal and ethical debate. Mass-bred chain-store stock can carry disease and weak genetics — source from a reputable breeder and quarantine.

Common questions

Why do angelfish need a tall tank?

With fins extended an adult stands about 20 cm (8 in) tall — taller than it is long. In a short tank it cannot fully extend its fins, so aim for at least roughly 45–50 cm of height regardless of gallons.

Can angelfish live with neon tetras?

Risky. An adult angelfish eats fish small enough to fit its mouth, and neons are classic prey — juveniles ignore them for months, then start picking them off. Use larger cardinal or black skirt tetras instead.

How many angelfish should I keep?

One, or a group of five or six — never two to four. Small groups let a dominant fish concentrate its bullying on one victim.

How big a tank for angelfish?

A 20-gallon 'high' for a single adult, 29 gallons for a community of up to four, and 55 gallons or more for a group of five or six — and at least about 45–50 cm tall.

How long do angelfish live?

Usually 8–12 years, sometimes 15-plus. Short lifespans almost always trace to small tanks and poor water, not the fish.

Are angelfish aggressive?

They are semi-aggressive cichlids, calm most of the time but predatory toward small fish, and a bonded breeding pair turns territorial and drives off tankmates.

Sources & confidence

Sources & confidence (9 species)

These back the Freshwater Angelfish figures and the previewed tank mates above. Each figure is read from the TankStocking species database (v2026.06); below is the care reference behind it and how confident we are in that data. Confidence reflects the source quality, not whether any pairing is safe. Full source list and the welfare model are on the methodology page.

• Freshwater Angelfish Pterophyllum scalare — Seriously Fish (seriouslyfish.com/species/pterophyllum-scalare) high confidence
• Bamboo Shrimp (Wood/Fan Shrimp) Atyopsis moluccensis — Aquariadise (aquariadise.com/caresheet-bamboo-shrimp-atyopsis-moluccensis) high confidence
• Boesemani Rainbowfish Melanotaenia boesemani — Seriously Fish; Aquarium Co-Op Boesemani guide high confidence
• Bolivian Ram Mikrogeophagus altispinosus — Seriously Fish (seriouslyfish.com/species/mikrogeophagus-altispinosus) high confidence
• Brilliant Rasbora Rasbora einthovenii — Seriously Fish (seriouslyfish.com/species/rasbora-einthovenii) high confidence
• Bristlenose Pleco Ancistrus sp. — Aquarium Source / aqua-fish.net Ancistrus care guides high confidence
• Celebes Rainbowfish Marosatherina ladigesi — Seriously Fish (seriouslyfish.com/species/marosatherina-ladigesi) high confidence
• Clown Pleco Panaqolus maccus — Fish Laboratory (fishlaboratory.com/fish/clown-pleco); AquariumStoreDepot high confidence
• Congo Tetra Phenacogrammus interruptus — Seriously Fish (seriouslyfish.com/species/phenacogrammus-interruptus) high confidence

Care-guide sources (12)

This guide synthesises the references below; where they disagree, the range and the disagreement are noted in the text above. The figures in the key-facts box are read from the TankStocking species database (v2026.06). Full welfare model on the methodology page.

• FishBase — Pterophyllum scalare
• Seriously Fish — Pterophyllum scalare
• Aquarium Co-Op — Angelfish Care Guide
• TFH Magazine — Pterophyllum scalare Care
• Wikipedia — Pterophyllum scalare
• Practical Fishkeeping — Keeping and breeding angelfish
• Angels Plus — How to Breed Angelfish
• AquaticCommunity — Breeding Angelfish
• A-Z Animals — Angelfish Lifespan
• The Aquarium Expert — Do Angelfish Eat Neon Tetras?
• AquariumStoreDepot — Angelfish Types
• AquariumScience — Hexamita and Hole-in-the-Head

More on Freshwater Angelfish

Related guides on TankStocking — each scored by the same welfare engine as the planner.

This care guide is a sourced planning reference, not veterinary advice — individual fish, filtration and maintenance all matter. Cycle the tank, test your water, and observe your fish. How TankStocking works →