Platies are among the best beginner fish in the UK hobby — hardy, peaceful, endlessly colourful, and forgiving of the mistakes every new fishkeeper makes. They are livebearers like guppies but slightly larger and calmer, making them a great choice for a first community tank.

Here is everything you need to keep them thriving.

Quick facts

• Adult size: 5–7 cm
• Tank size: 60 litres minimum
• Water: pH 7.0–8.4, hard water preferred, 22–26 °C
• Lifespan: 3–4 years
• Temperament: peaceful, community-safe

Tank setup

Platies suit a 60-litre-plus community tank with gentle to moderate flow. They like hard, slightly alkaline water — ideal for most UK tap water. Provide plants such as Vallisneria and open swimming space.

Cycle the tank first — see how to cycle a fish tank — and keep a 100W heater at 24 °C.

Feeding

Platies are omnivores with a herbivorous lean. Feed a quality flake daily plus vegetable-based food and occasional frozen bloodworm. See best fish food.

Breeding and tank mates

Platies breed readily — like all livebearers, females give birth to live fry every 4 weeks. Keep 2 females per male. For fry care, see our livebearer breeding guide.

Good tank mates: guppies, mollies, danios, corydoras, bristlenose plecos. Avoid fin-nippers and large aggressive fish.

Frequently asked questions

What size tank do platy fish need?

At least 60 litres for a small group. Platies are active and breed quickly, so more space helps manage the growing population and keeps water stable.

Are platies good for beginners?

Yes — they are among the hardiest, most peaceful and forgiving beginner fish, thriving in the hard, slightly alkaline water typical of most UK taps.

Do platy fish need a heater?

Yes. Platies are tropical and need stable water of 22–26 °C, so a thermostatic heater is essential in UK homes.

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— Jaqline Smalling, FishForever