How can I tell a male platy from a female?

Male platies are generally smaller, more brightly coloured, and possess a modified, stick-like anal fin called a gonopodium. Females are larger, rounder in the belly, and have a standard fan-shaped anal fin.

Why is my female platy hiding at the bottom of the tank?

This is often a sign that she is pregnant and about to give birth. Providing her with dense plant cover or moving her to a breeding box can help reduce stress and protect the fry.

What is the best ratio of males to females?

You should aim for a ratio of at least two or three females for every male. Male platies are relentless in their mating pursuits, and having more females spreads out the harassment, preventing any single fish from becoming overly stressed.

Do I need a heater for platies?

Yes, while platies are hardy and can tolerate cooler temperatures down to 20°C, they are fundamentally tropical fish. A stable temperature around 24°C maintained by an aquarium heater is optimal for their health and digestion.

How do I stop my platies from eating their babies?

Adult platies have no parental instincts. The best way to protect the fry is to densely plant your aquarium with fine-leaved plants like Java Moss or Guppy Grass, giving the babies places to hide until they are large enough not to be eaten.

FreshwaterTropicalBeginner

Platy

Xiphophorus maculatus

A vibrant, robust livebearer that adds a splash of colour and lively activity to community aquariums.

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Ideal Conditions

Temperature: 20 – 26 °C
pH range: 7 – 8.2
Hardness: 10 – 25 dGH
Adult size: 3 – 6 cm
60L for a small breeding group: 60 litres+
Lifespan: 3 – 5 years
Diet: Omnivore
Water flow: Moderate
Preferred setup: Planted aquarium with open swimming spaces and hiding places for fry.

About the Platy

The Platy is one of the most iconic and enduring species in the aquarium hobby. Renowned for its rainbow of available colours and resilient nature, Xiphophorus maculatus is the quintessential beginner's fish. Originally hailing from the warm, vegetated waters of Central America, decades of selective breeding have produced countless dazzling varieties, from the classic Mickey Mouse to striking tuxedo and wagtail forms. They are highly active and bring constant, peaceful movement to the middle and upper levels of the tank.

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Where Platy comes from

Native range

Central America, North America

Countries / regions

Mexico, Belize, Guatemala, Honduras

Habitat

Slow-moving rivers, streams, canals, and warm swamps with dense vegetation and hard, mineral-rich water.

Introduced and established in many tropical and subtropical areas worldwide due to the aquarium trade.

Similar species

Swordtail
Xiphophorus hellerii
Variable Platyfish
Xiphophorus variatus
Molly
Poecilia sphenops

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Bronze Corydoras
Corydoras aeneus
Peaceful bottom dwellers that share similar water requirements and occupy a different swimming zone.
Great
Bristlenose Pleco
Ancistrus sp.
Hardy algae eaters that thrive in the same hard water parameters without bothering the active platies.
Great
Guppy
Poecilia reticulata
Fellow peaceful livebearers that enjoy identical water conditions; they cannot crossbreed with platies.
Great
Swordtail
Xiphophorus hellerii
While highly compatible in temperament and habitat, they belong to the same genus and will readily hybridise.
Compatible with caution
Tiger Barb
Puntigrus tetrazona
Tiger Barbs can be notorious fin nippers, which may pose a risk to slower platies with elongated or elaborate fins.
Compatible with caution
Siamese Fighting Fish
Betta splendens
Bettas may perceive brightly coloured male platies as rivals and attack them, leading to severe stress.
Not recommended
Angelfish
Pterophyllum scalare
Adult Angelfish will actively hunt and consume platy fry, and may eventually prey on smaller adult males.
Not recommended

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