What's the easiest tropical fish to keep?

The Guppy. Hardy, tolerant of UK hard tap water, accepts any food, breeds readily, and lives 2-3 years. A group of six male guppies in a cycled 60L tank is the single lowest-maintenance tropical setup you can run. Platies are a very close second.

Can I mix beginner fish together?

Yes — that's the point of a community tank. Every species in our top 10 coexists peacefully with the others. A typical beginner stocking is one schooling species (Neons, Rasboras, Danios), one livebearer group (Guppies, Platies, Mollies), one bottom-dwelling species (Corydoras), and one clean-up crew (Bristlenose Pleco or Cherry Shrimp).

How many beginner fish can I keep in a 60L tank?

Around 10-15 small community fish (under 5cm adult size). For example: 6 Harlequin Rasboras + 4 Platies + 5 Corydoras works well. Don't add everything at once — stock in three stages over 6 weeks to let the filter bacteria keep up with the rising bioload.

What fish should a beginner NOT start with?

Angelfish (sensitive as juveniles, territorial as adults), Discus (demand pristine warm soft water), Oscars (grow to 30cm), Common Plecos (grow to 45cm), most cichlids (aggressive), Chinese Algae Eaters (turn aggressive with age), and wild-caught species (stressed, often parasitised).

Are Neon Tetras good for beginners?

Yes, but only in a mature tank — one that's been running for at least 6 weeks. In a brand-new cycled tank they're the single most likely species to die from parameter swings. Harlequin Rasboras are a hardier alternative with similar shoaling behaviour.

Can beginners keep Bettas?

Yes but they're a solo fish — one male Betta in a 20-30L planted tank with heater and gentle filter, no tank mates. Bettas aren't community fish. They're a great first solo-species tank for someone who wants a single showpiece fish.

How much do beginner tropical fish cost in the UK?

£2 to £5 per fish for the hardy community species. A starter stocking of 15-20 fish runs £40-£80. Add £15 for delivery and you're at £55-£100 for a fully stocked 60-90L community tank. Cherry Shrimp are the best value — a group of 10 is around £30 and they breed.

Do I need to keep beginner fish in groups or can I have one of each?

Shoaling species (Tetras, Rasboras, Danios, Corydoras) must be in groups of 6 or more. Kept solo they stress, hide, and die young. Livebearers (Guppies, Platies, Mollies) can be kept solo or in small groups. Bristlenose Plecos and Honey Gouramis can be solo.

What's the hardiest tropical fish for beginners in hard UK water?

Livebearers — Guppies, Platies, Mollies, Endlers. UK tap water is typically medium-to-hard (10-25 dGH) and pH 7.2-7.8, which is exactly what livebearers evolved for. Soft-water species like Cardinal Tetras need more care with UK water.

How long do beginner tropical fish live?

Livebearers (Guppies, Platies, Mollies): 2-3 years. Small tetras (Neons, Embers): 4-7 years. Corydoras: 5-10 years. Bristlenose Plecos: 10-15 years. Honey Gouramis: 4-6 years. Cherry Shrimp: 1-2 years. Lifespan depends heavily on water quality — a well-maintained tank consistently gets the top of each range.

Can beginners keep tropical fish without live plants?

Yes, absolutely. A gravel substrate, rock and driftwood decor, and silk or plastic plants works fine for every fish in our top 10. Live plants add biological filtration and look better over time, but they're not essential for fish health in a cycled tank.

What's the best first tropical fish for a 30L or 40L tank?

Cherry Shrimp colony — a group of 15 shrimp in a 30L planted tank is the single best nano-tank setup for a beginner. Alternative: one male Betta with 6-8 Cherry Shrimp in a 30-40L. Avoid trying to fit a full community tank into anything under 60L — it won't cycle stably.

Do beginner tropical fish need a heater?

Yes — all tropical fish need stable temperatures between 22-27°C depending on species. A 50W heater handles a 60L tank in a typical UK home; go 100W for 90-120L and 150W for 150L+. Undersized heaters can't keep pace with UK winter room temperatures.

10 Best Beginner Tropical Fish for UK Aquariums (2026)

Every week we get emails that start the same way: "I'm new to this and I don't know what fish to buy first." This page is the answer we'd send — I'm Tom, the nano-tank and beginner writer on the site, and the ten species below come straight from three years of "what do I do now?" questions on my YouTube channel.

The ten species below are the ones we'd happily put in a cycled 90 L tank and send home with a first-time keeper, confident they'll still be thriving six months later. They're picked against four criteria: hardy in UK conditions, peaceful in a community tank, widely in stock year-round, and tolerant of the minor parameter swings that every new aquarist's tank will have.

A mature planted beginner community tank with guppies and rasboras

This is roughly the stocking we'd put in a 90 L first tank — a mixed school of rasboras, half a dozen livebearers, a small corydoras pod. Photo: Tropical Fish Co.

UK-specific selection criteria

UK tap water is typically medium-to-hard (10-25 dGH) with pH 7.2-7.8 ^[?]. That's ideal for livebearers and most South American tetras but uncomfortable for soft-water specialists (Chocolate Gouramis, wild Discus, some Apistogramma). Every species below thrives in standard UK tap water without remineralisation.

Five facts most "best beginner fish" lists never mention

Livebearers have been in the UK hobby since 1908. The Guppy was the first tropical ornamental imported to the UK in commercial volume; every beginner list since has put it in the top 3 ^[?].
"Cycling the tank" means growing bacteria, not fish. A new tank needs 4–6 weeks of ammonia-dosing (fish-less) or small-stocking-plus- testing to build the nitrogen-processing bacteria that keep the fish alive ^[?].
Neon Tetras are MORE fragile than Cardinals in new tanks. Despite being the "classic beginner fish", neons suffer badly in the parameter swings of a tank under 8 weeks old ^[?]. Harlequin Rasboras are our hardier swap.
Every fish on this list is commercially farmed. None are wild-caught, so there's no conservation trade-off in buying them. Compare that to some cichlids and catfish where wild-catching still dominates ^[?].
The single biggest beginner killer is overfeeding, not wrong fish. More beginner tanks crash from ammonia spikes caused by uneaten food than from anything on the water-chemistry sheet. Feed what they eat in 30 seconds, twice a day. That's it.

Watch: what a stable beginner community tank looks like

Before spending any money — watch what you're aiming at. The clip below is our in-house 90 L first-stocking showcase.

Our 90 L beginner community display: rasboras mid-water, corydoras on the substrate, a bristlenose pleco on the wood, cherry shrimp grazing the moss.

1. Guppy (Poecilia reticulata)

The livebearer that made tropical fishkeeping a hobby rather than a rich person's pastime. Guppies tolerate the entire range of UK tap water, eat anything, and come in dozens of colour strains from £2.50 specimens to £30 show-quality fancies.

Why it's great for beginners:

Tolerates UK hard tap water perfectly — no water preparation needed
Eats any dry or frozen food; forgives missed feeds
Kept as males-only for no-fry tanks, or 1:3 male-to-female for breeding
Never outgrows a 60L tank
Short life cycle (2-3 years) means you see the full lifespan before committing to a second species

Group size: 5-6 minimum for mixed-sex; males can be kept in smaller groups or solo

Full care guide: Guppy care.

2. Neon Tetra (Paracheirodon innesi)

The small schooling tetra that every beginner has heard of, and still one of the most rewarding in a mature planted tank. A dense school of twenty Neons moving as one through aquascaped foreground plants is one of the classic sights of the hobby.

Why it's great for beginners:

Tight shoaling behaviour — they actually school together, unlike some nominally-schooling species
Short (3cm) so 10-15 of them fit a 60L tank comfortably
Widely available year-round, always in stock, always at reasonable prices
One of the few tetras that breeds in captivity at commercial scale, so stock is farmed rather than wild-caught

Add Neons to a mature tank, not a new one

Neons are the single most common casualty of beginners stocking a newly-cycled tank. They're sensitive to the small parameter swings that happen in the first 6-8 weeks after cycling completes. Add Neons last, ideally 6+ weeks after the first fish went in.

Group size: 10 minimum; 15-20 looks much better and they school tighter

Full care guide: Neon Tetra care.

3. Platy (Xiphophorus maculatus)

The hardiest livebearer in the hobby. Platies come in red, blue, orange, variegated, and sunset colour strains, stay compact at 5-6cm, and breed with zero encouragement. If Guppies are the entry-level livebearer, Platies are the upgrade for anyone who wants slightly chunkier fish with more visual impact.

Why it's great for beginners:

Built for UK hard tap water — one of the few fish that actively prefers higher pH
Livebearer, so you see fry in the tank within a few weeks
Peaceful with every other species on this list
Hardy enough to survive almost any beginner mistake short of skipping the cycle
Lives 2-3 years

Group size: 3-5 (livebearers don't need strict shoals); mixed-sex works but expect fry

Full care guide: Platy care.

4. Cherry Shrimp (Neocaridina davidi)

The best value in the hobby. A starter colony of 10 Cherry Shrimp is around £30 and, given a planted tank and no predators, turns into 100+ shrimp within a year. They eat algae, biofilm, and leftover food. They're peaceful with every community fish species that won't fit them in its mouth.

Why it's great for beginners:

Tolerant of cooler room temperatures (18°C+), so survives heater failure
Breeds without any intervention
Actively cleans the tank — visible results within weeks
Teaches water chemistry because shrimp are sensitive to parameter swings before fish are
10 shrimp cost less than a single fancy guppy

One colony, one colour

Cherry Shrimp come in red, blue, yellow, chocolate, snowball white, and other colours — but they're all the same species (Neocaridina davidi) and crossbreed readily. If you want to maintain colour purity in a breeding colony, stock ONE colour per tank. Mixed colonies muddy to brown/grey within a generation.

Group size: 10 minimum to establish a colony; 20+ gives faster colonisation

Full care guide: Cherry Shrimp care.

5. Molly (Poecilia sphenops / Poecilia latipinna)

The bigger cousin of the Guppy and Platy. Mollies hit 8-12cm depending on strain, producing real visual presence in a 90L+ tank, and they come in black, dalmatian, gold, silver, sailfin, and balloon varieties. They tolerate a wider salinity range than any other common tropical fish — some keepers run low-salt brackish Molly tanks.

Why it's great for beginners:

Bigger fish means more visible personality and interaction
Extremely hardy — tolerate mild water chemistry issues that would stress smaller fish
Livebearer, so fry show up naturally
Loves hard UK tap water
Active surface-to-mid swimmers, fill the upper water column

Not suitable for 60L tanks

Mollies get too big for a 60L. Minimum 90L for Short-fin varieties, 120L for Sailfin. Undersize them and they get aggressive with tank mates.

Group size: 3-5, ideally more females than males

Full care guide: Molly care.

6. Harlequin Rasbora (Trigonostigma heteromorpha)

Our single most-recommended schooling fish for first-time aquarists. The Harlequin is hardier than any tetra, tolerates the entire UK pH range, schools tightly, and moves beautifully across the middle of the water column. If you want one peaceful schooling species, this is what we'd pick.

Why it's great for beginners:

Widest pH tolerance of any common schooler (6.0-8.0) — copes with any UK tap water
Tight shoaling behaviour
Adult size fits 60L+ tanks easily
Striking copper-orange body with black triangular patch — more visual impact per pound than Neons
Less fussy about tank maturity than Neons

Group size: 8 minimum; 10-12 is ideal

Full care guide: Harlequin Rasbora care.

7. Corydoras Catfish (Corydoras spp.)

The community tank's essential bottom-dweller. Bronze and Peppered Corydoras are the hardiest and most widely stocked; Panda, Sterbai, and Julii Corys are the slightly fancier (and more expensive) strains. Whichever you pick, they patrol the substrate, eat leftover food, and behave like a small friendly gang.

Why it's great for beginners:

Cleans up uneaten food before it fouls the substrate
Peaceful with every fish species on this list
Hardy, long-lived (5-10 years), and active during the day
Fun to watch — they occasionally dash to the surface for a gulp of air (they're facultative air-breathers)

Sand substrate, not sharp gravel

Corydoras sift substrate with their barbels (the whisker-like sensors under their mouth). Sharp gravel wears barbels down and causes infections. Use smooth rounded gravel or fine sand.

Group size: 6 minimum — they're genuinely schooling catfish and stress when kept in smaller numbers

Full care guide: Corydoras care.

8. Zebra Danio & Celestial Pearl Danio (Danio rerio / Celestichthys margaritatus)

Zebra Danios are the classic first schooling fish for UK beginners — they tolerate cooler water (18-24°C) than any other species on this list, which makes them the best pick for a room without reliable heating. Celestial Pearl Danios are the modern upgrade: smaller, more colourful, and stunning in nano planted tanks.

Quick stats (Zebra): Size 5cm | Temp 18-24°C | pH 6.5-7.5 | Tank mates: active community | Price: £2.50-£4 each

Quick stats (Celestial Pearl): Size 2cm | Temp 20-25°C | pH 6.5-7.5 | Tank mates: small peaceful community | Price: £4-£7 each

Why they're great for beginners:

Danios as a genus tolerate cooler temperatures than any other tropical
Active, constant swimming — fills the upper water column
Small enough for 60L tanks
Celestial Pearls add a splash of red-orange finnage that most hardy species lack

Group size: 6-8 minimum for both

Full care guide: Celestial Pearl Danio care.

9. Bristlenose Pleco (Ancistrus sp.)

The algae eater worth buying. Unlike the misnamed "Common Pleco" that grows to 45cm, the Bristlenose stays at 10-12cm, actively eats algae throughout its life, and fits a 90L+ community tank perfectly. One Bristlenose handles a medium-sized tank's algae without touching your plants.

Why it's great for beginners:

Genuine algae eater (not the cosmetic algae-eater-but-really-just-sucks-on-glass variety)
Max 12cm — doesn't outgrow sensible tanks
Long-lived (10-15 years)
Colour strains include albino, snow white, and long-finned
Peaceful with every community species

Add driftwood — they need it

Bristlenose Plecos rasp driftwood for fibre. Without driftwood in the tank, they can develop digestive issues. A single piece of Mopani or Malaysian driftwood is enough.

Group size: Solitary (one per tank) or a breeding pair

Full care guide: Bristlenose Pleco care.

Mature planted community tank — the end goal for a first-time UK aquarist

What your 90 L tank can look like six months in. Diffused lighting, mid-ground java fern + anubias, gentle flow, a settled community. Photo: Tropical Fish Co.

10. Honey Gourami (Trichogaster chuna)

The gentlest, prettiest gourami for beginners. A pair of Honey Gouramis adds a golden centrepiece to a planted community tank without the aggression that Three-Spot or Pearl Gouramis show. They breathe atmospheric air (labyrinth organ), so they'll survive low-oxygen incidents that would kill other species.

Why it's great for beginners:

Genuinely peaceful — one of the few gouramis suitable for mixed community tanks
Labyrinth organ makes them tolerant of low-oxygen water
Striking gold/orange colour with pale blue highlights
Interactive — they recognise their keeper and follow you at the front glass
Smaller than other gouramis, so fit 90L+ tanks

Group size: Pair (male and female) or solo. Two males in the same tank will fight.

Full care guide: Honey Gourami care.

Fish to avoid as a beginner

Despite how often they're marketed to beginners, these species cause the most first-tank disasters:

Angelfish juveniles. Sensitive to water quality, territorial as they mature, and they eventually eat small tetras. Reserve for a second, larger tank once you have cycling and water changes dialled in.

Common Plecos. Grow to 40-45cm, produce huge waste loads, and only the Bristlenose variety stays small. Any shop selling a 5cm Pleco to a beginner for a 60L tank is setting them up for failure.

Discus. The king of the hobby, but demand pristine soft warm water, daily attention, and experience reading fish behaviour. Not a first fish.

Cichlids (most). Territorial, aggressive to tank mates, and specific water requirements. Rams and Apistogramma look approachable but are genuinely intermediate-level fish.

Chinese Algae Eater. Peaceful when small, becomes aggressive and territorial with age, eventually attaching to other fish to rasp their slime coat. Stick with Bristlenose Plecos or Otocinclus instead.

Wild-caught species. Shipping stress and parasite load are higher. Look for "tank-bred" or "aquaculture" on the label.

Goldfish. Not tropical — they want cooler water (18-22°C) and produce 3-4x the waste of similar-sized tropical fish. Need 100L+ per fish. A beginner tropical setup is not a goldfish home.

A starter fish I don't recommend anymore

The Zebra Danio used to be my number one beginner recommendation. Hardy, peaceful in groups, tolerates cooler water. But I've seen too many beginners stock 6 Zebra Danios in a 60L and end up with aggression issues — they're nippier and more active than most small community fish, and they can stress shyer tank mates. Harlequin Rasboras fill the same niche with better temperament.

Stocking your first tank

Don't buy fish at random — plan the whole tank up front. Three proven stocking plans:

60L community (starter)

Schooling centrepiece: 6-8 Harlequin Rasboras
Livebearers: 4 Platies (mixed colours, 1 male 3 females)
Bottom-dwellers: 5 Bronze Corydoras
Clean-up: 10 Cherry Shrimp

Total fish load: moderate. Add over 6 weeks in the order above.

90L community (classic)

Schooling centrepiece: 10 Cardinal Tetras OR 12 Harlequin Rasboras
Livebearers: 6 Guppies (males only, mixed strains)
Bottom-dwellers: 6 Bronze Corydoras
Algae crew: 1 Bristlenose Pleco
Invertebrates: 10 Amano or Cherry Shrimp

Total fish load: full but not overstocked. Add over 8 weeks.

120L showpiece

Centrepiece: A pair of Angelfish OR 2 Honey Gouramis
Schooling fish: 15 Cardinal Tetras OR 12 Ember Tetras
Livebearers: 5 Platies
Bottom-dwellers: 8 Peppered Corydoras
Algae crew: 1 Bristlenose Pleco
Invertebrates: 15 Amano Shrimp

Total fish load: high — requires weekly 30% water changes and a proper external filter.

Before you buy: check your setup

Every species on this page assumes a cycled tank — one that's been running for 4-6 weeks with ammonia-only dosing until ammonia and nitrite both read 0 within 24 hours of feeding. If your tank isn't cycled, the fish will die within days, regardless of how hardy they are.

Full cycling walk-through: Beginner Aquarium Setup.

'Fish-in cycling' is not recommended

Fish-in cycling (adding fish to an uncycled tank and letting the nitrogen cycle establish around them) works but causes measurable harm to the fish — burnt gills, shortened lifespan, and high casualty rates. Every fish in this guide deserves a cycled tank. Spend 4-6 weeks on fishless cycling before your first order.

Ready to stock your first tank?

Browse the full beginner-friendly range: fresh water fish and shrimp and invertebrates.

If you'd like us to check your stocking plan before ordering — tank size, species mix, water parameters — email us with the details. We'd rather spend 10 minutes on email now than ship fish into a tank that won't suit them.

The 10 Best Beginner Tropical Fish for UK Aquariums

Five facts most "best beginner fish" lists never mention

Watch: what a stable beginner community tank looks like

1. Guppy (Poecilia reticulata)

2. Neon Tetra (Paracheirodon innesi)

3. Platy (Xiphophorus maculatus)

4. Cherry Shrimp (Neocaridina davidi)

5. Molly (Poecilia sphenops / Poecilia latipinna)

6. Harlequin Rasbora (Trigonostigma heteromorpha)

7. Corydoras Catfish (Corydoras spp.)

8. Zebra Danio & Celestial Pearl Danio (Danio rerio / Celestichthys margaritatus)

9. Bristlenose Pleco (Ancistrus sp.)

10. Honey Gourami (Trichogaster chuna)

Fish to avoid as a beginner

Stocking your first tank

60L community (starter)

90L community (classic)

120L showpiece

Before you buy: check your setup

Further reading

Ready to stock your first tank?

Shop the products in this guide

Neon Tetra Tropical Fish - UK

Chocolate Cherry Shrimp (Neocaridina davidi) - UK

X Gold Sailfin Molly (Poecilia velifera) - UK

Frequently asked questions

Related guides

Tropical Fish for Sale in the UK: Our Top Picks for 2026

How to Buy Tropical Fish Online in the UK: Complete Buyer's Guide

How to Set Up Your First Aquarium: A UK Beginner's Guide