How many angelfish can I keep together?

Juveniles (3–7 cm): group of 6 in a 120 L tank works well — they shoal loosely. Adults (8+ cm): either a bonded pair in 200 L, OR a group of 6+ in 400 L where no single pair can dominate. The middle ground — 3 or 4 adult angels in 150 L — doesn't work. Two will pair off, the third and fourth get harassed [3].

Can angelfish live with neon tetras or cardinal tetras?

Juvenile angelfish yes, adult angelfish no. Adult angelfish eat neon tetras. This is one of the most commonly-ignored community-tank warnings in UK hobby — a 10 cm adult angelfish can and will swallow a 3 cm neon tetra whole. Cardinal tetras (slightly larger) survive longer but are still at risk. If you want angelfish + tetras, use larger tetras (black skirt, lemon, Congo tetras) or plan to separate them when the angels mature.

How do I sex angelfish?

You can't reliably until they pair up. Juveniles and unpaired adults look identical. Males develop a slight forehead nuchal hump as they mature (4–6 months) but it's subtle. The reliable sex indicator appears during breeding: females extend a short blunt ovipositor, males a longer pointed breeding tube. Outside breeding state, commercial sexing is guesswork [4].

Do angelfish breed easily in home aquariums?

Yes — once they pair. A mature pair in soft, slightly acidic water (pH 6.5) at 27 °C will spawn on a broad leaf or a vertical surface (slate, driftwood, or the tank glass). Parents clean the site, spawn 200–800 eggs, and tend them — the pair-bond behaviour is one of the most satisfying things to watch in the hobby. Survival rate to free-swimming depends hugely on parents not eating the eggs (common in first-time parents) [8].

Which angelfish colour strain is best for a beginner?

Silver (the wild-type colour) or marble strains — they're the most genetically stable, disease-resistant, and least temperamental. Beginner-challenging strains are pure blacks (high mortality in some lines), koi (double-recessive genetics, some inbreeding depression), and veil-tail variants (finnage damage during shipping + tank life). Start with silver or marble, move to the fancy strains once you have experience.

How long do angelfish live?

8–12 years in a well-maintained tank [1]. Commercial ornamental-bred angels sometimes hit 6–8 years before genetic issues slow them; wild-caught Pterophyllum have been kept 15+ years in exceptional care. Budget for a decade-long commitment.

Do angelfish need a heater?

Yes, always. 24–29 °C, with 26 °C as the target [1]. UK homes don't reach these temperatures without a heater. Heater wattage: 2 W per litre as a rule of thumb — a 200 L tank needs a 400 W heater (two 200 W units for redundancy is common in serious cichlid setups).

Can angelfish live with African cichlids?

No. African Rift Lake cichlids (Mbuna, Peacocks) want hard alkaline water (pH 8.0+, dGH 15+) and are territorially aggressive. Angelfish want soft acidic water (pH 6.0–7.5) and are peaceful outside breeding. The two species are genuinely incompatible. If someone in a pet shop suggests mixing them, it's bad advice — go to a different shop.

Why is my angelfish turning pale / laying on its side?

Three main causes: (1) parasites — external ich or internal parasites are common in recent imports; treat with appropriate medication; (2) swim bladder issues — often from over-feeding or dry flake food causing constipation; fast 24 hours and feed a thawed frozen pea; (3) end-of-life — angelfish over 10 years old naturally slow down. If the fish is under 6 and suddenly ill, it's almost certainly (1) or (2).

Where should I buy angelfish in the UK?

Start by checking the welfare markers, not the shop name. Three things to verify before any angelfish purchase: (1) the shop tank houses angels in groups of 6+ (lone angels in a tank are destocked and stressed); (2) staff can name the species and tell you the tank size they came from; (3) the fish are 4+ cm body size, not stressed 2 cm juveniles that have just arrived from a wholesaler. For rare strains (koi, zebra, wild-caught Peruvian types) the British Cichlid Association runs UK-bred sales at club meets [8] — prices are well below retail and the fish come from documented breeding lines.

Are angelfish wild-caught or tank-bred?

99% of UK-trade angelfish are tank-bred from commercial farms in Singapore, Thailand, and the Czech Republic [5]. Wild-caught Pterophyllum scalare appear occasionally through specialist importers — they're larger, more robust, but require soft water and are more expensive (£25+ vs £5 for farm-bred). Wild-types interbreed with commercial strains but produce mixed patterning that's hard to track.

South American Cichlids · Buying Guide

Angelfish UK: Species Biology, Welfare & The Colour Strains In Stock

Read or listen to our UK angelfish guide - tank size, colour strains, adult behaviour, tank mates, breeding pairs and welfare-first buying advice.

By Priya RameshUpdated 18 April 202612 min read

Product photo · Tropical Fish Co warehouse· Own

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Visual route into the rest of our UK live-fish range.

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South American Cichlids for sale UK — Apistogramma, Rams, Oscars, Severums, Geophagus, Pikes, Discus and Angelfish.

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Centerpiece fish for sale UK — large, attention-grabbing species that anchor a display tank. Oscars, Discus, Angelfish, Arowanas, Severums.

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Planted-tank fish for sale UK — peaceful, plant-safe species that showcase aquascaped layouts. Tetras, rasboras, dwarf cichlids, shrimps.

Frequently asked questions

120 L minimum for juveniles, 200 L+ for an adult pair [6]. The common shop-display angelfish at 3 cm misleads buyers — these are juveniles that grow to 12–15 cm body-disc height. A 60 L tank cannot house an adult angelfish. Buying juveniles intending to upgrade the tank 'later' is the trap — upgrade before you buy, not after.

Sources & further reading

Every claim in this article is backed by a source below. We group them by type so you can judge the weight of each one at a glance.

Peer-reviewed study (1)

[2]
Schliewen, U. K. (1992). The freshwater angelfishes of the genus Pterophyllum. Tropical Fish Hobbyist, 40. View source
Foundational reference on the three recognised Pterophyllum species.

Scientific database (1)

[1]
Froese, R. and D. Pauly (Eds.) (2024). Pterophyllum scalare (Schultze, 1823). FishBase. View source
Source for body-size, pH, water parameters, and natural distribution.

Conservation authority (1)

[4]
(2023). Pterophyllum scalare — IUCN. IUCN. View source
Conservation status; all UK stock is farm-bred.

Hobbyist reference (3)

[3]
(2024). Pterophyllum scalare — Seriously Fish. Seriously Fish. View source
Husbandry + community-tank tolerance reference.
[5]
Jeremy Gay (2023). Angelfish in the UK aquarium — complete care. Practical Fishkeeping. View source
UK-specific husbandry and welfare reference.
[7]
(2023). British Cichlid Association — Pterophyllum standards. British Cichlid Association. View source
UK cichlid-keeping standards — cited on strain judging.

Expert video (1)

[8]
Cory McElroy (2023). How angelfish pair bonds form. Aquarium Co-Op (YouTube). View source
Reference on breeding pair formation dynamics.

Government / regulatory (1)

[6]
(2024). Aquatic animal welfare — tank size requirements. RSPCA. View source
UK welfare guidance cited on the minimum-tank-size argument.

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Angelfish UK: Species Biology, Welfare & The Colour Strains In Stock

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