Freshwater Angelfish Care Guide

Sold as a serene centrepiece for a peaceful community tank, the freshwater angelfish (Pterophyllum scalare) is really a tall Amazonian cichlid with a hunter's patience. It is slow, semi-aggressive and built to ambush: it needs height as much as gallons, and it will eat any fish small enough to fit its mouth. Hold that contradiction in mind and the rest of its care falls into place.

Freshwater Angelfish at a glance

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

Where it comes from

Angelfish come from the Amazon basin — Peru, Colombia and Brazil — where they hang in slow or still, clear-to-silty water among dense submerged plants, drowned roots and branches. That biotope dictates the care. The tall, laterally compressed body evolved to slip vertically between roots and plant stems, so the tank has to be tall and full of vertical structure, not open and shallow. Still water at the source means gentle flow in the tank; a strong powerhead leaves them stressed and ragged-finned. Their soft, slightly acidic home water (about pH 6–7, 3–10 °dH, 26–30 °C) is what they breed best in, even though they tolerate a wider range day to day. One trade note: most shop 'angelfish' are P. scalare or its hybrids, not the dramatically taller, fussier P. altum or the smaller P. leopoldi, which are different species with different demands.

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 number most tank-size guides skip past. The body reaches about 15 cm (6 in) long, but with the dorsal and anal fins fully fanned out a mature fish stands 20 cm (8 in) or more tall, taller than it is long. A single adult needs a 20-gallon 'high' as a floor; 29 gallons is the usual community minimum for up to four adults; a group of five or six wants 55 gallons or more. Whatever the gallon figure, the tank should clear roughly 45–50 cm in height, or mature angels simply cannot extend their fins. That is why a long, shallow 'breeder' tank is the wrong shape for adults even when its volume looks ample on paper.

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 genuinely adaptable to keep: they hold up across pH 6.0–8.0 and from soft to medium-hard water, though they look and spawn best in soft, slightly acidic conditions around pH 6.5–7, and hatch rates climb the softer and more acidic the water gets. Sources disagree on the edges — Seriously Fish caps the comfortable band nearer pH 7.4, FishBase stretches it to 8.0 — which is rather the point: hold a reading steady rather than hunt for a perfect one. Keep them warm, 26–30 °C (78–86 °F), with about 82 °F favoured for breeding and roughly 24 °C as the cool limit. Their real sensitivity is to ammonia, nitrite and creeping nitrate, so steady water and low nitrate matter far more than an exact pH number.

Diet & feeding

In the wild they are largely carnivorous — fish fry, small shrimp, crabs, worms, mosquito larvae and water bugs — and in the tank they turn into voracious omnivores. Build the diet on a good cichlid or community pellet or flake, then push variety hard with frozen or live bloodworms, brine shrimp, daphnia and tubifex; that vitamin-rich rotation is part of how you fend off hole-in-the-head, the lateral-line disease that also plagues fellow cichlids like the discus. Feed adults one or two small meals a day, growing juveniles more often, and resist overfeeding — fouled water is the main road into disease. And never forget what they are: patient hunters that will pick off small tankmates, fry and shrimp, even while size-safe companions such as corydoras stay comfortably off the menu.

Gear & setup

Aim for a tall, warm, gently filtered, planted tank. Soft sand or fine gravel, broadleaf plants like Amazon sword, driftwood branches and tall stems give them both the cover they crave and the vertical surfaces they spawn on. Keep flow modest to echo the still Amazon backwaters they come from — hard current unsettles them and frays those long fins over time. And fit a lid: a startled angelfish can launch itself clean out of an open tank.

Temperament & behaviour

Semi-aggressive is the honest label — 'tame for a cichlid', but a cichlid all the same, with a genuinely predacious streak. Picture a patient ambush predator that also happens to trail vulnerable, easily torn fins, which makes it both hunter and target depending on the company it keeps. The biggest shift comes at breeding: a bonded pair clears a territory and drives off everything in reach — former tankmates, and sometimes each other. That is textbook cichlid parenting, not sickness, so plan for it rather than panic.

Group & social needs

The numbers run against intuition: keep one, or a group of five or six, and avoid everything in between. A single angelfish is perfectly content on its own. In a group of five-plus, a pecking order still forms, but the aggression is spread thin so no one fish is hounded. Land in the danger zone of two to four and a dominant individual fixates on a single subordinate, which stops eating, hides, and can be bullied to death. The practical route is to buy a young group, grow them out together, and be ready to rehome some as pairs claim each other.

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 a name for its care guide, or use + 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
• Brilliant Rasbora+Peaceful temperament, similar adult size, not a fin-nipper
• Bristlenose Pleco+Uses the bottom zone, peaceful temperament, similar adult size, not a fin-nipper
• Celebes Rainbowfish+Peaceful temperament, similar adult size, not a fin-nipper
• Clown Pleco+Uses the bottom zone, peaceful temperament, similar adult size, not a fin-nipper
• Congo Tetra+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

Outside of breeding, sexing is largely guesswork — angelfish are monomorphic, and the one dependable tell appears only at spawning: the genital papilla, a thin pointed tube on the male versus a thicker, blunt ovipositor on the female. They choose their own partners from a group; you cannot reliably force two adults to pair. As vertical spawners they want a clean upright surface at least about 15 cm tall — a broadleaf plant, slate, length of pipe or a cone — and they are triggered by warmth, soft acidic water and conditioning on live foods. A single clutch can run to roughly 1000 eggs that hatch in two to three days, and both parents fan and guard eggs and fry with real devotion, though first-timers routinely eat their early spawns before they get the hang of it. Coaxing a spawn is easy-to-intermediate; raising the fry is where it gets hard.

Lifespan

With good care angelfish typically live 8–12 years, and 15 or more turns up where water, diet and genetics all line up. The familiar 'they only last 2–3 years' complaint almost never reflects the species — it traces back to cramped tanks, poor water and chronically high nitrate quietly wearing the immune system down.

Common mistakes

• Buying a short, long 'breeder' tank just because the gallons add up — it fails the height test, and adults cannot fully spread their fins; if your tank is under about 45 cm tall, walk away.
• Dropping them into a neon, ember or shrimp nano community — the classic neon-tetra trap: it looks harmless for months, then the grown angelfish starts eating the small fish one by one, often overnight.
• Keeping exactly two to four, which funnels all the bullying onto one fish; keep a single angel, a group of five or six, or a known bonded pair on its own.
• Housing them with fin-nippers such as tiger or serpae barbs, which tatter the long fins.
• Strong flow, or a bare, bright, open tank — a fast track to a stressed, skittish, fin-damaged fish.

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?

Skip the angelfish if your tank is under about 45 cm tall, if you are set on nano fish or dwarf shrimp (it eats them), if you can only fit exactly two to four, or if your community already includes fin-nippers. Watch the stock, too: 'balloon' or 'bubble' angels are a deformity morph — a shortened, compressed spine tied to swim-bladder and organ problems, and widely treated as an ethics issue — while GMO 'GloAngel' fluorescent strains carry their own legal and ethical baggage. Mass-bred chain-store fish can bring disease and weak genetics, so buy from a reputable breeder and quarantine. If that list rules you out but you still want a cichlid's character, a smaller, calmer dwarf such as the bolivian ram asks far less of the tank.

Common questions

Sources & confidence

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 →