Blue Guppy Care Guide - Aquarium Setup, Feeding & Breeding

Blue Guppies are selectively bred for blue coloration, which may appear across the body, in the tail, or as a metallic sheen over the flanks. Their exact pattern varies considerably between strains, with some displaying solid blue bodies and others combining blue with black, white, yellow or red markings. Males are especially prized for their broad, flowing tails and vivid colour.

These are lively, peaceful livebearers that spend much of their time in the middle and upper levels of the aquarium. They are active, inquisitive fish and readily investigate their surroundings, particularly when food is introduced. Their small size and striking colours have made them one of the most popular freshwater aquarium fish.

In the wild, Poecilia reticulata inhabits shallow streams, pools, drainage ditches and slow-moving margins with abundant vegetation. Wild populations are adaptable and can tolerate a range of conditions, although they generally favour warm, mineral-rich water. Blue Guppies retain the energetic character of their wild relatives while displaying the results of many generations of selective breeding.

Because guppies mature quickly and reproduce readily, a small group can develop into a sizeable population in a short time. They are best appreciated as a colourful group, with the males’ elaborate fins contrasting against the larger, more subdued females.

Blue Guppies are a cultivated colour variety of Poecilia reticulata, a species native to northern South America and nearby Caribbean islands. Wild guppies occur naturally in places including Venezuela, Guyana, Suriname, northern Brazil, Trinidad and Barbados, while introduced populations are now found in tropical regions around the world.

A group of Blue Guppies should have at least a 60-litre aquarium, with a guideline footprint of approximately 60 x 30 cm or larger. Keep the water around 22–28°C (72–82°F), with a slightly alkaline pH of about 7.0–8.0 and moderate to hard mineral content. Use gentle filtration, open swimming space and dense planting around the sides and rear, with floating plants providing cover for fry. A dark sand or fine-gravel substrate can enhance their colours, while smooth décor and subdued areas help create a secure layout. Use a lid because guppies can jump.

Males reach about 3–4 cm (1.2–1.6 in), while females are larger at up to approximately 5–6 cm (2.0–2.4 in), excluding the length of especially elaborate fins.

Blue Guppies are omnivores and do best on a varied diet of quality tropical flakes or small pellets supplemented with spirulina or other vegetable-based foods. Offer occasional frozen or live foods such as daphnia, baby brine shrimp, cyclops and bloodworm. Feed small portions once or twice daily, removing excess food to protect water quality, and provide appropriately fine foods for fry.

Blue Guppies are peaceful community fish and can be kept with similarly gentle species such as platies, mollies, peaceful tetras, rasboras, smaller Corydoras, kuhli loaches and honey gouramis. Avoid fin-nipping species such as tiger barbs, aggressive or highly territorial fish, and tankmates large enough to swallow them. Long-finned males may be harassed by persistent fin nippers, while very slow-moving fish can be disturbed by the guppies’ constant activity.

Blue Guppies are easy to breed and give birth to live young. Keep a healthy group with more females than males, ideally at least two or three females per male. After mating, a female can produce batches of fry every four to six weeks. Dense plants or a breeding box can help protect the fry, which should be offered finely crushed flake food, powdered fry food or newly hatched brine shrimp. Remove adults or provide plenty of cover, as guppies may eat their own young.

Blue Guppy males are smaller and considerably more colourful, with a modified anal fin called a gonopodium and usually larger, more ornate tails. Females are larger-bodied and less vividly marked, with a rounded abdomen and a visible dark gravid spot when carrying developing fry.