Green Cobra Guppy Care Guide - Setup, Feeding & Breeding

Green Cobra Guppies are colourful fancy guppies recognised for their green-toned bodies and cobra-style reticulated patterning, often combined with a broad, flowing tail. Individual fish can vary considerably, with markings ranging from fine net-like lines to stronger bands across the body and fins.

Males are smaller and especially ornate, displaying intense colour and elaborately shaped caudal and dorsal fins. Females are larger and less vividly marked, but may show attractive patterning and a rounded abdomen when carrying developing young.

These active livebearers spend much of their time in the middle and upper parts of the aquarium. They are generally peaceful, curious and social, although males may continually court females, creating a lively display of chasing and fin movement.

Poecilia reticulata is naturally associated with shallow streams, pools, drainage channels and slow-moving margins in tropical parts of South America and the Caribbean. The Green Cobra form does not represent a separate wild species; its distinctive appearance has been developed through selective breeding in captivity.

The Green Cobra Guppy is a selectively bred colour and pattern variety of Poecilia reticulata, a species native to northern South America and parts of the Caribbean. Wild guppies occur in countries including Venezuela, Guyana, Suriname, French Guiana, Brazil and Trinidad, while captive populations are now established throughout the ornamental fish trade.

A group of Green Cobra Guppies should have at least a 40-litre aquarium, with a larger tank preferable for mixed-sex groups and their frequent offspring. A practical minimum footprint is around 60 × 30 cm, with swimming space across the length of the tank. Use gentle filtration and a secure cover, with open areas for activity alongside hardy live plants, floating cover and wood or smooth décor. Fine gravel or sand is suitable, and dense vegetation is particularly valuable for sheltering fry.

Males usually reach about 3–4 cm (1.2–1.6 in), while females can grow to around 5–6 cm (2.0–2.4 in). Females are therefore noticeably larger and heavier-bodied than males.

Offer Green Cobra Guppies a varied omnivorous diet of quality tropical flakes or small granules, supplemented with frozen or live foods such as baby brine shrimp, daphnia and mosquito larvae. They also benefit from regular vegetable matter, including spirulina-based foods or blanched leafy vegetables. Feed small portions once or twice daily, giving only what they consume quickly, and provide appropriately fine foods for fry.

Green Cobra Guppies suit peaceful community aquariums with similarly gentle fish such as small tetras, rasboras, peaceful Corydoras, small danios, honey gouramis and other calm livebearers. Avoid fin-nipping species such as tiger barbs and serpae tetras, as well as large or predatory fish that may eat them. Long-finned males can also be harassed by persistent nippers, and keeping male-only or appropriately female-heavy groups helps limit breeding pressure.

Green Cobra Guppies are prolific livebearers and usually breed readily in a mature aquarium. Keep several females with each male to reduce persistent attention, and provide dense plants or spawning mops where fry can hide. After mating, a female can produce around 20–60 fully formed fry after roughly 21–30 days, although larger females may have more. Adults may eat the young, so move the female before birth or raise the fry separately with fine foods such as powdered flakes, baby brine shrimp and microworms.

Males are smaller, slimmer and far more colourful, with a gonopodium and enlarged, patterned fins. Females have a deeper, fuller body, a rounded anal fin and often a visible gravid spot near the abdomen, especially when carrying embryos.