Best beginner aquarium fish: hardy community species and how many to keep

TUREFF• •0

Choosing fish is the fun part of fishkeeping, and also where many beginners go wrong: buying on looks alone, or adding too many too fast. The best first fish are hardy, peaceful, happy in the same water and suited to the size of your tank. Always add fish only once your tank has finished cycling.

What makes a good beginner fish

Tolerant of small mistakes in water quality and temperature.
Peaceful, so it can share a community tank.
A manageable adult size. Some fish sold small grow far too large for a home aquarium, so always check the adult size before buying.
Easy to feed on ordinary prepared foods.

Hardy community species

Typical temperature ranges below are approximate and sources differ, so check a species profile for any fish you buy, and choose species whose ranges overlap comfortably.

Neon tetras: small, bright schooling fish. Commonly kept around 22 to 26°C. They are more delicate than their reputation suggests, so they are best added to a mature, stable tank rather than a brand new one. Keep them in a proper group.
Zebra danios: very active, hardy schooling fish that tolerate cooler water than many tropicals. Keep a group; alone, they can become nippy or stressed.
Harlequin rasboras: calm, attractive schooling fish, commonly kept around 22 to 28°C.
Corydoras catfish: peaceful bottom-dwellers that like company of their own kind, so keep them in a group. Give them sand or smooth gravel to protect their barbels.
Platies and similar livebearers: hardy and colourful. They breed readily, so be prepared for fry or keep a single sex.
Bristlenose catfish: a small algae-eater that stays a sensible size, unlike some common plecos, which grow very large.

Bettas

Betta splendens, the Siamese fighting fish, is popular and characterful, and is commonly kept at around 24 to 28°C in a heated, filtered tank. Male bettas must be kept apart from other male bettas, as they fight, often to serious injury. Many keepers house a male alone, because he may also nip long-finned or brightly coloured tankmates, or be nipped by fin-nippers. Bowls and tiny unheated containers do not suit them, despite how they are often sold.

Schooling fish need a school

Many small fish feel safe only in numbers. Kept singly or in twos, they hide, stress and sicken. A group of at least six is a common minimum for schooling species, and more is better where the tank allows.

Avoiding overstocking

There is no perfect formula, and old one-liners such as a fixed length of fish per volume of water ignore body shape, activity and waste. More useful habits:

Plan the adult size and number of every fish before buying any.
Check that each species has enough swimming space; active fish need length.
Add a few fish at a time, wait a couple of weeks, test the water, then add more.
Leave room. A lightly stocked tank is healthier and easier to look after.
If water quality struggles despite good maintenance, you probably have too many fish.

Fish to research carefully first

Common goldfish: often sold as starter fish, but they grow large, produce a lot of waste and suit big tanks or ponds rather than small tanks. They also prefer cooler water than tropical species.
Large cichlids, common plecos and some sharks: can outgrow home tanks or be aggressive.
Anything sold with little information: ask the adult size, temperament and water needs before buying.

Buying healthy fish

Look for fish that swim normally, have clear eyes and intact fins and show no white spots or patches. Avoid tanks with dead or obviously sick fish. Quarantining new arrivals in a separate tank is good practice. What were your first fish, and how did they do? Share your experience or ask about a stocking plan in the comments below.