Angelfish care looks deceptively easy on a fish-store tag: peaceful community fish, easy water parameters, eats anything. But the most-Googled angelfish problems all trace back to two things that tag never mentions. Their bodies grow as tall as they grow long, so a standard 20-gallon community tank is too short for adults to swim upright comfortably. And despite their gentle reputation, angelfish are slow, deliberate predators that will absolutely eat neon tetras, ember tetras, and any fish small enough to fit in their mouth.
Get those two things right, plus the soft, warm water they came from in the Amazon, and angelfish are one of the most rewarding centerpiece fish in the freshwater hobby. They pair-bond, they raise fry, they recognize their keepers, and they live 8 to 10 years with the right setup. This guide covers exactly how to set up an angelfish tank, what tank mates actually work, what to feed them, the color varieties you’ll see at the store, and how to read the body language that tells you a pair has bonded.
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Angelfish care at a glance
| Attribute | Detail |
|---|---|
| Common Names | Angelfish, Freshwater Angelfish, Common Angelfish |
| Scientific Name | Pterophyllum scalare (most aquarium-trade angelfish are hybrids of multiple Pterophyllum species) |
| Family | Cichlidae (cichlids) |
| Origin | Amazon basin (Brazil, Peru, Colombia, French Guiana) |
| Adult Size | 6 inches long, 8-10 inches tall (vertical body shape) |
| Lifespan | 8-10 years in well-maintained tanks |
| Tank Size | 30 gallons minimum for one (TALL tank, 18+ inches high). 55+ for a pair, 75+ for a small school. |
| Temperature | 76-86°F (24-30°C); ideal 78-82°F |
| pH | 6.0-7.5 (slightly acidic to neutral) |
| Temperament | Generally peaceful but predatory toward small fish; pair-bonded angelfish defend territory aggressively |
| Diet | Omnivore. High-protein flake or pellet base, supplemented with frozen and live foods. |
| Care Level | Moderate. Hardy once water and tank height are right; water-quality sensitivity rises with temperature. |
What angelfish look like (and how to sex them)
An angelfish is a fish you recognize at a glance: a tall, laterally-flattened diamond-shaped body with long flowing dorsal and anal fins that effectively double the visual height, plus thread-like trailing pelvic filaments that drag below. Adults reach roughly 6 inches snout-to-tail but 8 to 10 inches from the tip of the dorsal fin to the tip of the anal fin. That vertical dimension is the defining feature of angelfish anatomy and the source of most rookie tank-size mistakes.
Wild-type angelfish are silver with three to four black vertical bars and a soft yellow-bronze tint along the upper body. The aquarium trade has bred dozens of color morphs over the past 75 years, and most fish you’ll find at a local fish store are far removed from wild type. Captive-bred angelfish are also taxonomically uncertain: many “Pterophyllum scalare” in the trade are likely hybrids between P. scalare, P. altum, and P. leopoldi after generations of selective breeding.
Sexual dimorphism
Angelfish are difficult to sex visually until they pair-bond. Mature males tend to develop a slightly more pronounced cranial bump (nuchal hump) and slightly thicker, more pointed pelvic fins. Females are often deeper-bodied through the abdomen, especially when carrying eggs. The most reliable way to know you have a male and a female is to watch them bond: pair-bonded angelfish stay near each other constantly, defend a small territory, and clean a vertical surface (slate, broad leaf, filter intake) together in preparation for spawning. If you want a breeding pair, the proven method is buying 6 young angelfish and letting them sort themselves out as they mature.
Angelfish color varieties
Most angelfish in the hobby fall into one of these patterns. All have identical care requirements; choose by what catches your eye.
| Variety | Description |
|---|---|
| Silver (wild type) | Classic silver body with three to four black vertical bars. Closest pattern to wild Pterophyllum scalare. |
| Marble | Mottled black-and-silver “marbled” pattern. Each fish is unique. Very popular and widely available. |
| Koi | White, orange, and black patches resembling Japanese koi. Color intensifies with age. |
| Black / Black Lace | Solid or near-solid black body, sometimes with subtle vertical bar showing through. Lace variant has finer black mottling on fins. |
| Gold / Gold Pearlscale | Yellow-gold body without the black bars. Pearlscale variant has iridescent metallic scales reflecting under tank lighting. |
| Veiltail | Genetic variant with extra-long, flowing fins. Available in any color base. More fragile fins than standard varieties. |
| Albino | Pink-white body with red eyes. Light-sensitive; prefers dimmer lighting. |
| Altum (wild) | Pterophyllum altum. Genuinely wild species, much taller (up to 13 in fin-to-fin), demands soft acidic water (pH 4.5-6.0). Advanced keepers only. |
Angelfish tank size and setup requirements
Tank size and height
Angelfish tank requirements are the single most-overlooked piece of angelfish care online. The common “30 gallons for an angelfish” advice is correct on volume but misleads on shape: a 30-gallon BREEDER (36 in long, 12 in tall) is too short for adult angelfish to swim upright comfortably. The fish needs height clearance roughly equal to its body height (8-10 inches) plus headroom. A 30-gallon TALL or a 29-gallon standard (both around 18 in tall) is the practical minimum.
Recommended sizing:
| Setup | Tank | Notes |
|---|---|---|
| 1 angelfish + community | 30 gallon TALL (18+ in tall) | Practical floor. 29 gallon standard works. |
| Pair (breeding-bonded) | 55+ gallon | Pairs become territorial during spawning; small tanks force fights. |
| School of 4-6 | 75-90 gallon | Ideal angelfish setup. Multiple fish reduce one-on-one aggression. |
| Show tank (8+) | 120 gallon+ | Larger groups dilute pair-bonded aggression. Tall tank essential. |
Not sure how much water your tank actually holds? Use our aquarium volume calculator to confirm gallons from the actual dimensions before you stock.
Filtration
Angelfish need clean water with low-to-moderate flow. They’re tall-bodied fish with broad lateral surface area, and strong directional currents push them around and stress them. Aim for 5-7× tank turnover per hour, lower than most community-fish recommendations. A canister filter with a spray bar (which diffuses output across a wider area) suits angelfish particularly well. Hang-on-back filters work fine in smaller setups; just direct the output toward a wall or use a baffle to reduce direct flow into the tank center.
For specific filter recommendations matched to your tank size, see our guide to the best aquarium filters.
Heating
Angelfish are tropical fish from the Amazon basin and require a heater. Target 78-82°F (25-28°C) for general keeping, or push to 82-86°F if conditioning a pair for breeding. Below 76°F, angelfish become sluggish, lose appetite, and grow more susceptible to ich and fungal infections. The sweet spot for typical care is 80°F.
Water conditions
| Parameter | Target |
|---|---|
| Temperature | 76-86°F (24-30°C); ideal 78-82°F |
| pH | 6.0-7.5; ideal 6.5-7.0 |
| GH | 3-12 dGH (soft to moderate) |
| KH | 3-8 dKH |
| Ammonia | 0 ppm always |
| Nitrite | 0 ppm always |
| Nitrate | <20 ppm long-term; can tolerate 30-40 ppm short-term |
Angelfish water-change cadence is 25% weekly. They tolerate harder, more alkaline water than discus or wild altum angelfish, but they thrive in soft, slightly acidic conditions that mimic their Amazon-basin origin. Use a quality dechlorinator on every water change.
Substrate, decor, and lighting
Substrate choice is open: sand, fine gravel, or planted-tank aquasoil all work. Angelfish don’t dig the substrate aggressively the way larger cichlids do, so any clean, fish-safe substrate works fine.
Decor matters more than substrate for angelfish. They want vertical surfaces: tall driftwood pieces, broad-leaved plants like Amazon swords or Anubias on rock, or vertical slate slabs. These serve two purposes — visual cover that reduces stress, and spawning surfaces if a pair forms. A bare-bottom tank with no vertical structure makes angelfish skittish and discourages natural behavior.
Plants are highly recommended. Angelfish are South American Amazon fish, so a planted Amazon-style aquascape with Amazon swords, Vallisneria, Cryptocoryne, and floating plants creates the dim, dappled light environment they prefer. Floating plants also break up surface light, reducing skittishness in newly-introduced fish. Lighting should be moderate — bright LED fixtures designed for high-tech planted tanks can stress angelfish. The best LED aquarium lighting guide covers fixtures with adjustable intensity that work well for low-to-medium-light planted angelfish tanks.
What do angelfish eat?
Angelfish are omnivorous predators. In the wild they eat insect larvae, small crustaceans, fry of other fish, and occasional plant matter. In captivity they thrive on high-protein flake or pellet foods supplemented with frozen and live foods. Color and pattern intensify on a varied protein-rich diet.
Recommended foods
| Food | Type | Notes |
|---|---|---|
| High-protein cichlid flake or pellet | Daily staple | Hikari Cichlid Bio-Gold, Northfin Cichlid Formula, or similar 40-45% protein cichlid food. Slow-sinking pellets work better than floating; angelfish are mid-water feeders. |
| Frozen bloodworms | Protein supplement | 2-3 times weekly. Excellent for color development and breeding conditioning. |
| Frozen brine shrimp | Protein supplement | Highly attractive to angelfish; supports digestive function. Rotate with bloodworms. |
| Live blackworms | Premium live food | Best food for breeding conditioning. Source from a reliable supplier; cultured live worms can introduce parasites if from wild collections. |
| Spirulina flakes | Plant-matter supplement | Once or twice weekly to provide vegetable component. Important for digestive health. |
For a cichlid-formulated daily staple that suits angelfish (and works for any other South American soft-water cichlid), Hikari Tropical Discus Bio-Gold is what most experienced angelfish keepers settle on:
How much, how often
Adult angelfish do well on two small feedings per day, sized so all food is consumed within 2-3 minutes. Juveniles benefit from three smaller feedings as they grow rapidly. Overfeeding is the most common feeding mistake: leftover food fouls water and angelfish are sensitive to ammonia and nitrite spikes. Belly fullness is a good indicator — slightly rounded means well-fed, distended is overfed, concave means underfed.
Best angelfish tank mates (and what to avoid)
Angelfish tank mate selection is where most well-meaning aquarists go wrong. The fish-store narrative paints angelfish as peaceful community fish, which is partly true but misses two failure modes: angelfish eat smaller fish, and pair-bonded angelfish become territorially aggressive during spawning. Choose tank mates that are too big to be eaten and not so peaceful that they get bullied during a spawn.
Compatibility table
| Species | Compatibility | Notes |
|---|---|---|
| Discus | Good | Same parameters (warm soft acidic water), same Amazon biotope. Classic angelfish + discus tank pairing. |
| Rummynose Tetras | Good | Larger tetras (1.5+ inches), too big to eat. Active schoolers that complement angelfish stillness. |
| Congo Tetras | Good | Large peaceful tetras (3 inches), iridescent. Won’t be eaten and won’t bother angelfish. |
| Corydoras (any species) | Good | Bottom-dweller, different niche. Sturdy enough to ignore mid-water angelfish behavior. |
| Bristlenose Pleco | Good | Algae cleanup, peaceful, won’t outcompete angelfish for food. Common pleco grows too large; bristlenose stays under 5 inches. |
| Bolivian Ram | Good | Peaceful dwarf cichlid, different water level. Avoid breeding both species simultaneously to prevent territorial conflict. |
| Tiger Barbs | Caution | Notorious fin-nippers in groups under 6. Long angelfish fins are tempting targets. Possible in 75+ gal with 8+ tiger barbs to dilute aggression. |
| Serpae Tetra | Caution | Fin-nippers similar to tiger barbs. Possible only in large groups (8+) and large tanks. |
| Other Angelfish | Caution | Single, pair, or group of 4+ works. Three creates two-against-one bullying. Pairs become aggressive during spawning. |
| Neon Tetras / Cardinal Tetras | Avoid | Despite the classic “tetras + angelfish” community-tank cliché, neons and cardinals are angelfish food at adult angelfish size. Will be eaten. |
| Ember Tetras / Chili Rasboras | Avoid | Even smaller. Definitely consumed by adult angelfish. |
| Aggressive cichlids (oscars, jack dempseys, convicts) | Avoid | Will outcompete and bully angelfish. Different aggression level. |
| Goldfish | Avoid | Cool-water species; temperature mismatch. Angelfish need 78-82°F, goldfish optimum is 18-24°C (64-75°F). |
For a more in-depth look, see our companion guide on tank mates that work with angelfish.
Common angelfish diseases and how to treat them
Signs of a healthy angelfish
A healthy angelfish swims with fins fully extended, holds itself upright in the water column, and shows clear bright eyes with no clouding. Color and pattern should be vivid; pale or faded coloration in a previously bright fish indicates stress or early illness. Active interest in food and bold behavior near the front of the tank are good signs. Lethargy, hiding, fins clamped against the body, or rapid gill movement are all warning signs that warrant immediate water testing.
Common diseases
| Condition | Symptoms | Treatment |
|---|---|---|
| Ich | White grain-of-salt spots on body and fins; flashing against decor | Raise temp to 84-86°F (within angelfish range), use ich-X or salt at 0.1-0.2% concentration. 7-10 days minimum. |
| Hexamita / Hole-in-the-Head | Pitted holes on the head and lateral line; gradual wasting | Metronidazole in food and water column for 5-7 days. Address underlying water quality and stress; common in nutrient-deficient fish. |
| Velvet | Gold-dust appearance on body, rapid gill movement, lethargy | Cupramine or copper-based treatment, dim lighting (parasite is photosynthetic). Quarantine treatment recommended. |
| Fin rot | Tattered, receding fin edges; often follows physical damage from fin-nippers or rough decor | Improve water quality first. Antibiotics (Furan-2, Maracyn) for severe cases. Remove fin-nipping tank mates. |
| Internal parasites | Wasting despite eating; stringy white feces; bloated abdomen | Metronidazole + praziquantel (PraziPro) combo. Quarantine all new arrivals. |
Prevention
Most angelfish illnesses trace back to water quality, stress, or new-fish introductions. Weekly 25% water changes, consistent temperature, and 2-4 weeks of quarantine for new arrivals prevent the majority of issues. Angelfish are particularly stress-prone after introduction; minimize handling, dim lights for the first few days, and don’t add multiple new fish at once.
How to breed angelfish at home
Angelfish are accessible breeders and one of the most-bred cichlids in the freshwater hobby. They form monogamous pairs, choose a vertical surface (slate, broad leaf, or a piece of PVC pipe), clean it together, and lay eggs in tidy rows on the surface. The pair guards the eggs aggressively against tank mates. Hatching takes about 60 hours at 80°F; fry are free-swimming after another 4-5 days, attached to the egg sites by mucus threads in the meantime. Both parents fan eggs with pectoral fins to maintain oxygenation.
To encourage breeding, condition a young group on protein-rich diet (live blackworms, frozen bloodworms), maintain stable warm water (80-82°F), and provide several flat vertical surfaces. Pairs typically form by 8-12 months of age. The challenge isn’t getting them to spawn but keeping fry alive: eggs and fry are easily eaten by tank mates, and many first-time spawning pairs eat their own eggs out of inexperience. Move the pair to a dedicated breeding tank or remove the spawning slate to a hatch tank to maximize fry survival.
Angelfish care FAQs
How big do angelfish get?
Adult angelfish reach 6 inches snout-to-tail and 8-10 inches tall when fins are fully extended. The vertical dimension matters most for tank choice: a tank under 18 inches tall is too short for adults to swim upright comfortably. Wild altum angelfish (P. altum) grow even taller, up to 13 inches fin-to-fin.
Can angelfish live with neon tetras?
No, despite the classic community-tank cliché. Adult angelfish will eat neon tetras when they grow large enough; small tetras are angelfish food in the wild. The pairing sometimes works in the short term while the angelfish are still juveniles, but predictably fails when the angelfish reach 3-4 inches. For schooling fish that survive alongside angelfish, choose larger tetras like rummynose, congo, or black skirt tetras.
How long do angelfish live?
Angelfish typically live 8-10 years in well-maintained aquariums. Some long-lived individuals reach 12-15 years. Lifespan correlates strongly with water quality and tank size; angelfish kept in cramped or poorly-maintained tanks rarely make it past 5 years.
How can I tell if my angelfish are male and female?
Reliable sexing of angelfish is hard until they pair-bond and begin breeding behavior. Mature males develop a slightly more pronounced cranial bump and slightly more pointed pelvic fins; females are deeper-bodied through the abdomen, especially when carrying eggs. The proven approach is to buy 6 young angelfish and let them sort themselves into pairs as they mature.
Why is my angelfish hiding?
Angelfish hide when stressed by inadequate cover, aggressive tank mates, water-quality problems, or recent introduction to a new tank. First, test water parameters (ammonia, nitrite, nitrate, pH). Second, check for fin damage suggesting bullying from tank mates. Third, add vertical structure (driftwood, broad-leaved plants) to the tank — angelfish in barren tanks feel exposed. Newly-introduced angelfish often hide for 2-3 days as they acclimate; this is normal.
Are angelfish aggressive?
Angelfish are generally peaceful but can become territorially aggressive in two situations: when pair-bonded during spawning, and when housed in a group of three (which creates a two-against-one dynamic). Single angelfish, pairs in adequate tank space, or groups of four or more typically coexist peacefully. They are also predatory toward small fish, which is different from cichlid-style aggression.
Is an angelfish right for your tank?
Angelfish care comes down to three commitments most generic guides skip: pick a tank that is genuinely tall enough for adult angelfish (18+ inches), match tank mates to their actual predatory profile (no neon tetras, even though everyone says it works), and maintain warm soft acidic water that mirrors their Amazon-basin origin. Get those three right and angelfish are a long-lived, charismatic, breedable centerpiece species worth the moderate setup effort.
Equipment-wise, the levers worth investing in are filtration with a flow-diffusing spray bar (see our best aquarium filters guide for tank-size matched recommendations) and moderate, dimmable lighting (covered in the best LED aquarium lighting roundup). Pair angelfish with a planted Amazon-style aquascape and a thoughtful tank-mate roster from the angelfish tank mates guide, and you have a tank that will reward you for a decade.
