Angelfish are the fish most beginners buy too early. They’re beautiful, widely available in every UK aquatic shop, and marketed as “community-friendly” — which is true when they’re 3cm juveniles and stops being true by the time they’re 15cm adults. Every year, thousands of angelfish are rehomed or die because they were sold to a 60L community tank that couldn’t sustain them.

Kept properly — in a tank big enough, with the right tank mates, at correct water chemistry — angelfish are one of the most rewarding fish in the freshwater hobby. Long-lived (10+ years), personable, form breeding pairs, and grow into stunning adults. Kept wrong, they end up as aggressive bullies in a tank they’ve outgrown.

This guide covers the honest UK-focused version.

Quick facts

• Scientific name: Pterophyllum scalare
• Origin: Amazon Basin — slow, warm, tannin-stained blackwater
• Adult size: 15 cm tall (including fins), 8–10 cm body length
• Lifespan: 10–12 years typical, 15+ possible
• Water temperature: 25–29°C
• pH: 6.0–7.5 (prefer slightly acidic)
• Water hardness: soft to medium (3–10 dGH ideal)
• Minimum tank size: 150L for 2 adults; 250L+ for a group
• Social: semi-aggressive; form pairs; territorial when spawning

Not a beginner fish

Before anything else: angelfish are marketed as community fish but aren’t beginner-friendly. Reality:

• Adult size 15 cm tall. Needs a tank at least 45 cm tall for swimming space.
• Long-lived. 10+ years commitment.
• Semi-aggressive. Adults become territorial and can bully smaller fish.
• Eat small fish. Neon tetras added to a tank of adult angels become dinner within days.
• Need proper water chemistry — soft, slightly acidic. UK hard-water areas struggle.

If this is your first tank, stop. Read our best aquarium fish for UK beginners guide instead. Come back to angelfish once you’ve kept a community tank for a year without incident.

Colour varieties in UK trade

All the same species; hundreds of years of selective breeding produced dozens of colour morphs:

• Silver / wild-type — silver body with black vertical stripes
• Zebra — extra dark stripes
• Marble — irregular black-and-silver mottled
• Koi — orange, black, white patches (koi-like)
• Blushing — pearly-white body, red gills
• Veil-tail — elongated flowing fins
• Half-black — dark rear half
• Gold — solid yellow

Care is identical across morphs. Wild-type silvers are the hardiest — the more heavily line-bred fancy morphs are more prone to health issues.

Tank setup

Tank size — the big one

• Two angelfish (pair): 150L absolute minimum, 200L+ preferred
• Group of 4–6: 250L minimum
• Show tank: 300L+ ideal

Height matters more than length for angels. A 60cm-long × 45cm-tall tank suits angels better than a 90cm-long × 30cm-tall tank of the same volume.

Filter and heater

Filter: external canister with moderate flow diffused via spray bar. Angels dislike strong current. Fluval 307 for 150–200L tanks or larger for bigger setups. See our best aquarium filter UK guide.

Heater: 200W adjustable for 200L, 300W for 300L+. See our best aquarium heater UK guide.

Plants and hardscape

Tall plants suit angel body shape:

• Vallisneria — tall background grass
• Amazon sword — the classic angel-tank centrepiece, grows to 40cm
• Java fern on wood — mid-height
• Anubias — hardy, angels ignore it
• Floating plants (Amazon frogbit) for shade

Hardscape: tall vertical wood (spider wood, manzanita branches) works better than horizontal wood for angel tanks — mimics submerged tree roots in their natural habitat.

Water chemistry

Cycle the tank properly first — see our UK cycling guide.

• Ammonia / Nitrite: 0 (always)
• Nitrate: under 20 ppm — angels are sensitive to nitrate long-term
• pH: 6.5–7.2 ideal; tolerate up to 7.5
• Temperature: 26–28°C
• Hardness: soft to medium (3–10 dGH)

UK soft-water areas (Scotland, Wales, Devon/Cornwall) suit angels perfectly. Hard-water areas (London, Home Counties) will see less colour and fewer breeding attempts unless you soften the water — see our how to lower pH guide.

Indian almond leaves are strongly recommended — release tannins that lower pH gently and provide the blackwater environment angels evolved in. One or two leaves per 50L, replaced monthly.

Feeding

Omnivorous with a strong preference for animal protein.

Daily options:

• High-quality cichlid pellets — Hikari Cichlid Excel is the standard
• New Life Spectrum Cichlid Formula — premium option
• Standard high-quality tropical flake as backup

Treats 3–4× a week:

• Frozen bloodworm — angels love it
• Frozen brine shrimp
• Live brine shrimp if you can hatch them
• Frozen mysis shrimp

Occasional:

• Blanched pea (helps digestion, one per week)
• Small pieces of raw prawn or white fish (prawn especially — brings out colour)

Feed twice a day, only what fish clear in 2 minutes.

Tank mates

The crux issue. Angelfish tank-mate rules:

Compatible with juveniles + adults:

• Other angelfish — best in pairs or groups of 5+ (avoid trios; the middle fish gets bullied)
• Medium-large peaceful tetras — Congo tetras, black skirt tetras, buenos aires (careful with fin-nipping), silver dollars
• Corydoras catfish — hardy peaceful bottom-feeders
• Bristlenose plecs — perfect cleanup crew
• Kribensis or German blue rams — smaller cichlids, coexist peacefully in bigger tanks
• Rainbowfish — peaceful, similar water preferences
• Discus — same water needs, larger tanks

Incompatible with adults:

• Small tetras (neons, cardinals, ember, harlequin rasboras) — adult angels eat them. Fine as juvenile angel companions but NOT once angels reach 8cm+.
• Guppies, endlers — the flowing fins get nipped, small ones get eaten
• Shrimp — cherry, ghost, amano — all eaten by adult angels
• Bettas — territorial conflict, one usually kills the other
• Aggressive cichlids — jack dempseys, oscars, larger cichlids

Buying strategy: if you already have neons in a tank, DON’T add angelfish “because they’re small right now.” Six months later you’ll be down 20 neons.

Sexing angelfish

Very difficult except when spawning. Adult sexual dimorphism is subtle:

• Male: slightly more pointed dorsal fin, more pronounced forehead “nose” bump as adult, longer ventral fins
• Female: slightly rounder body, shorter ventral fins

Reliable sexing: watch behaviour. A confirmed spawning pair sits together, defends a territory, and cleans a flat surface (leaf, glass, slate). The female produces eggs; the male fertilises.

Buy 5–6 juvenile angels; they’ll pair off naturally as they mature. The other unpaired individuals may need rehoming as the pair claims territory.

Breeding

Angelfish breed readily in home tanks IF water is right.

Setup:

• Established breeding pair
• 100L+ dedicated breeding tank OR pair-territory within larger community
• pH 6.5–7.0, soft water, temperature 27–28°C
• A slate, broad leaf (Amazon sword), or vertical PVC pipe as a spawning surface

Process:

1. Pair cleans a spawning surface obsessively for a day
2. Female deposits a line of eggs; male immediately fertilises
3. Repeated over 30–60 minutes; final clutch 200–1,000 eggs
4. Both parents guard the eggs, fanning constantly with fins
5. Eggs hatch in 48–72 hours; fry attach to the surface with sticky filaments
6. Free-swimming after 5–7 days
7. Feed fry on freshly-hatched brine shrimp

Reality warning: first-time breeding pairs often eat their eggs or fry. This is normal. They usually get it right by the third or fourth attempt.

To improve fry survival: remove parents after eggs are laid, and hatch/raise fry artificially with a small air stone and methylene blue in the water.

Common problems

Fin damage / bullying — angel-on-angel aggression when trios or dominance struggles. Rehome the aggressor or add more angels (odd or even numbers matters less than total count of 5+).

HITH — Hole In The Head (Hexamita) — small pits appearing above eyes and along lateral line. Usually caused by poor water quality + poor diet. Treat with metronidazole (Waterlife Octozin) or specific metronidazole medications. Fix underlying water quality.

Ich (white spot) — see our ich treatment guide. Standard treatment.

Fin rot — bacterial infection following fin damage. See our fin rot guide.

Sudden death of adult angels — often internal parasites or organ failure from years of unideal water. Adult angels benefit from periodic prophylactic deworming with Sera Nematol or similar.

Bottom line

Angelfish need a tank most beginners don’t have (150L+), water chemistry many UK areas don’t naturally provide (soft slightly acidic), and tank-mate management most beginners aren’t ready for (semi-aggressive, eat small fish as adults).

If you have all three, they’re one of the most beautiful and rewarding fish in the hobby. If you don’t, buy honey gouramis, dwarf gouramis, or a school of larger tetras instead until you’re set up for angels properly.

Then commit to 10+ years of care. It’s worth it.

Frequently asked questions

What size tank do angelfish need?

At least 150 litres for a pair, and a tank at least 45 cm tall to accommodate their 15 cm height. Groups need 250 litres or more.

Can angelfish live with neon tetras?

Only while the angelfish are small juveniles. Adult angelfish eat neon tetras and other small fish, so they are not safe long-term tank mates.

Are angelfish good for beginners?

Not really. They grow large, need soft acidic water, become territorial, and eat small fish. Beginners are better starting with hardier community species.

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Related: best aquarium fish for UK beginners (safer first-tank options), best aquarium heater UK (larger heater needed), best aquarium filter UK, how to lower pH in an aquarium.

— Jaqline Smalling, FishForever