Guppy Care Guide - Setup, Feeding, Tankmates & Breeding

Guppies are small, active livebearers celebrated for their remarkable variety of colours, patterns and tail shapes. Selectively bred males may display vivid reds, blues, yellows, greens and metallic shades, often combined with mosaic, tuxedo, snakeskin or cobra markings. Females are generally larger and less colourful, although modern strains can show attractive patterning of their own.

These energetic fish spend much of their time in the middle and upper levels of the aquarium, moving constantly through open water and vegetation. Males perform persistent courtship displays, spreading their tails and positioning themselves around females, while groups typically remain peaceful and sociable.

In nature, Guppies inhabit shallow streams, drainage ditches, ponds, pools and slow-moving rivers. They are adaptable fish that can tolerate a range of conditions, and wild populations often occupy habitats with aquatic plants, leaf litter and warm, sunlit water.

Poecilia reticulata has been kept and bred in aquariums for well over a century. Its rapid reproduction, approachable temperament and extraordinary genetic diversity have made it one of the most familiar freshwater fish, while also making it a popular subject in genetics and evolutionary research.

Guppies originate from northern South America, including Venezuela, Guyana, Suriname, French Guiana and parts of Brazil, and they also occur naturally on several nearby Caribbean islands. Through deliberate introductions, they are now established in tropical waters across many parts of the world.

A group of Guppies should have at least a 40-litre aquarium, with a larger tank preferable for mixed-sex groups or breeding colonies. Aim for a tank around 60 cm long or more to provide useful swimming space, while allowing room for the fish to move through open water. Use a secure lid, gentle filtration and plenty of live plants, particularly fine-leaved species that offer shelter to females and fry. A dark, smooth substrate, open swimming areas and some floating cover create a natural-looking, practical layout.

Males reach approximately 3.5 cm (1.4 in), while females can grow to about 6 cm (2.4 in).

Guppies are omnivores that naturally graze on algae, plant matter, tiny crustaceans, insect larvae and other small organisms. Offer a varied diet based on a quality small tropical flake or micro-pellet, supplemented with foods such as baby brine shrimp, daphnia and finely chopped frozen foods. Spirulina-based foods and occasional blanched vegetables can provide useful plant matter. Feed small portions that they consume quickly, with young fry receiving appropriately tiny, frequent meals.

Guppies suit peaceful community aquariums and can be kept with similarly gentle fish such as small tetras, rasboras, Corydoras, peaceful dwarf gouramis, platies and small bristlenose catfish. Avoid large, predatory or aggressive species, as well as fin-nipping fish such as tiger barbs. Long-finned fancy males may be harassed by persistent nippers, and very small fry will be eaten by many community fish. Avoid keeping them with species that require substantially different water conditions.

Guppies are prolific livebearers and will usually breed readily in a mixed-sex aquarium. Keep several females for each male to reduce persistent courtship, and provide dense plants or a separate breeding area where fry can shelter. Females give birth to free-swimming young after a gestation of roughly 21–30 days, producing anywhere from a few dozen to well over 100 fry. Adults may eat the young, so remove the female after birth or raise the fry separately and offer them suitably fine food.

Guppies show pronounced sexual dimorphism. Males are smaller, more slender and usually far more colourful, with enlarged flowing caudal and dorsal fins and a pointed gonopodium beneath the body. Females are larger and deeper-bodied, generally less vividly marked, and develop a dark gravid spot near the abdomen when carrying young.