Poeciliidae

Green Guppies

Poecilia reticulata

A form of:Common Guppy

Green Guppies, or their scientific name Poecilia reticulata (Green variety), belong to the family Poeciliidae. This name is used as a collective term to denote a number of artificially bred strains that display a dominant green coloration either in the body or in the fins. Such coloration is most often found in Neon Guppy and Moscow Guppy (European sample) strains, and to a lesser extent in Cobra Guppies.

Tank
from 40 L (11 gal)
Temperature
17 – 28 °C (63 – 82 °F)
Size in aquarium
3 – 6 cm (1.2 – 2.4 in)
Acidity
pH 7–8.5
Natural rangeRange on the map
  • Antigua Barbuda
  • Barbados
  • French Guiana
  • Guyana
  • Suriname
  • Trinidad and Tobago
  • Venezuela

Tank conditions

Plan the tank stocking
Temperature
17 – 28 °C (63 – 82 °F)
Water pH
Neutral (7) – Slightly alkaline (8.5)
Water dH
Medium hardness (10) – Very hard (30)
Water salinity
low (3–5 g/L)
Size in aquarium
3 – 6 cm (1.2 – 2.4 in)
Lifespan
3 years
Temperament
Peaceful (regular)
Toward small fish
not a predator
Required aquarium volume
from 40 L (11 gal)
Lighting
dimmed
Substrate
any (no restrictions)
Water flow
weak or moderate
Swimming level
near the surface
Feeding
Any (universal)
Keeping
Mixed solitary / pair / group
Jumping
noticeable a lid is needed
  • Lifespan. A lifespan to expect under good care, not a measured value: it depends heavily on tank volume, water quality and diet — and for selectively bred forms, on their origin as well.
  • Toward small fish. Based on the Predators category in the catalog or the temperament in the species parameters. “A risk to small fish” means the species is not a predator by habit, yet will swallow any fish that fits in its mouth.
  • Required aquarium volume. This is a husbandry recommendation, not a measured value: the volume depends on the keeping mode (mixed (solitary / pair / group)), footprint, decor and tank mates.

Care and keeping

Description

Green Guppies are a selective variety of Poecilia reticulata, combining strains with a predominance of green pigment in the coloration of the body and fins. Males reach 3–4 cm, are distinguished by a bright metallic sheen and well-developed fins, the shape of which varies from fan-shaped to veil-like. Females are larger, growing up to 5–6 cm, have a more modest coloration and a rounded abdomen.

Habitat

In nature, wild guppies inhabit fresh and brackish waters of Central and South America, as well as the Caribbean. They prefer areas with dense vegetation and slow currents. Green forms are the result of artificial selection and are not found in natural conditions.

Behavior and Compatibility

These are peaceful, schooling fish, suitable for community tanks. Males may show intraspecific competition, displaying their fins to each other, but without causing injuries. They are compatible with most peaceful species of comparable size. When kept with aggressive or very active fish, there is a risk of their long fins being nipped.

Care and Maintenance

For successful keeping of Green Guppies, the key factors are tank cleanliness, peaceful tankmates, and a well-balanced diet. These requirements, universal for most aquarium fish, require a more detailed understanding. Due to their modest size and unpretentiousness to environmental conditions, Guppies can live in a relatively small aquarium, equipped with a minimal set of equipment, provided regular care. This care includes timely removal of organic residues, be it uneaten food or excrement, as well as weekly partial water changes with fresh water, possibly more often. If the number of inhabitants does not exceed 2–3 fish per 10 liters, a simple airlift filter can be used. However, with denser stocking, a full-fledged internal or external filter will be required. The water preparation process usually does not cause difficulties, as Guppies show high adaptability to a wide range of hydrochemical parameters. Often it is enough to let the water stand before pouring it into the aquarium. As for feeding, the daily diet can consist exclusively of dry foods, but it is important to ensure that they contain all the necessary vitamins and trace elements. Specialized foods developed for this type of fish will be an excellent choice. It is also desirable to introduce frozen and live foods into the diet, such as Artemia, bloodworms, or daphnia. In terms of behavior, these fish are distinguished by a peaceful disposition. Although males compete for the attention of females, this usually does not lead to serious skirmishes. Their "display of strength" is limited to spreading their fins and swimming slowly opposite each other. Guppies get along well with most other species of comparable size.

Diet

Omnivorous species. In the aquarium, they accept all types of dry, frozen, and live foods. To maintain bright coloration and health, it is recommended to diversify the diet, including plant supplements. Feed small portions several times a day to avoid overeating and water pollution.

Breeding and Reproduction

Live-bearing fish, whose reproduction does not require special conditions. Fertilization occurs inside the female, after which she gives birth to fully formed fry. To preserve the offspring, it is recommended to use dense plant thickets or to move the pregnant female to a separate aquarium, as adult individuals tend to eat the fry.

Diseases

The species is hardy, but with poor water quality, it is susceptible to typical diseases such as ich and fin rot. The key factor in prevention is maintaining cleanliness in the aquarium, regular water changes, and a balanced diet. They are sensitive to sharp changes in hydrochemical parameters.

How to choose

When purchasing, choose active individuals with clean fins without signs of plaque or damage. Avoid fish with clamped fins, sluggish behavior, or an unnaturally swollen abdomen. It is recommended to purchase individuals from a single source to reduce the risk of infection.

Compatibility

There are no pair reviews for this species yet — check tankmates in the matcher.

All tankmates

Plants and this fish

Matching water does not mean the plant will stay intact.

Frequently asked questions

The essentials: size, tank volume, water parameters and care

How big does Green Guppies get?

An adult reaches 3–6 cm in length. Plan the tank around the maximum size: the fish quickly outgrows a cramped setup.

What size aquarium does Green Guppies need?

The recommended volume is 40 L. A smaller tank speeds up nitrate build-up and raises stress levels.

What water parameters does Green Guppies need?

Temperature 17–28 °C, pH 7–8.5, hardness 10–30 dGH. Stability matters more than exact values: sudden swings are harder on the fish than a small deviation from the ideal.

How long does Green Guppies live?

Around 3 years when kept properly. Lifespan depends directly on tank volume, water quality and a varied diet.

Is Green Guppies aggressive?

Temperament: peaceful (regular). Keep this in mind when choosing tank mates.

How many Green Guppies should be kept together?

Recommended setup: mixed (solitary / pair / group). Ignoring this is a common cause of stress and disease.

What does Green Guppies eat?

Diet type: any (universal). Feed small portions that are finished within a couple of minutes — overfeeding does more harm than underfeeding.

What is the scientific name of Green Guppies?

The scientific name of the species is Poecilia reticulata, family Poeciliidae. It also appears in the literature as: Acanthophacelus guppii, Acanthophacelus reticulatus, Girardinus guppii.

Similar fishes

Matched by family, categories and overlapping keeping conditions

Albino Guppy

Albino Guppy

Poecilia reticulata

Poeciliidae

The Albino Guppy, belonging to the Poeciliidae family, is known by its scientific name Poecilia reticulata (Albino variety). A distinctive feature of this fish is the congenital absence of melanin – the black pigment in…

Black Guppies

Black Guppies

Poecilia reticulata

Poeciliidae

Black Monk Guppies, also known as Black Guppies, are a breed of Poecilia reticulata (Black strain) from the Poeciliidae family. One of the main features of this variety is the pronounced dark body coloration in males.…

Blue Guppies

Blue Guppies

Poecilia reticulata

Poeciliidae

Blue Guppies, known scientifically as Poecilia reticulata (Blue variety), belong to the Poeciliidae family. This name is a generalization and encompasses various breeds where blue is the dominant color. It is mainly…

Cobra Guppy

Cobra Guppy

Poecilia reticulata

Poeciliidae

The Cobra Guppy, scientifically known as Poecilia reticulata (Cobra variety), belongs to the family Poeciliidae. Its distinctive feature is a pattern of vertical stripes running along the posterior part of its body. The…

Other scientific names and conservation status

Other scientific names
Acanthophacelus guppii, Acanthophacelus reticulatus, Girardinus guppii, Girardinus reticulatus, Haridichthys reticulatus, Heterandria guppyi
Poecilia reticulata
variety Green
Conservation status
Least concernLC