Guppy (male)

A livebearing showoff, trailing rainbows through quiet tropical currents.

Male guppies bring vivid colour and lively movement to peaceful freshwater community tanks, making them an easy-care favourite for beginners and nano aquariums.

• Water conditions: Male guppies are adaptable but thrive in a mature, fully cycled aquarium with stable parameters. Aim for a temperature of 22–26°C, pH between 6.8 and 7.8, and moderate hardness around 8–15 dGH. Keep ammonia and nitrite at 0 ppm and nitrate below 20 ppm with regular testing. They tolerate a wide range but dislike sudden swings, so use a reliable heater and thermometer. Provide gentle filtration with a baffled outlet; strong current can stress males and wear them down. A lid is important because guppies can jump. Although guppies are sometimes kept in lightly brackish setups, they are true freshwater fish and do not need salt in a standard community tank. Drip-acclimatise new arrivals over 30–45 minutes, especially if your water differs in temperature or hardness.
• Suitable tank mates: Choose peaceful community fish of similar size that will not nip flowing fins. Good options include small tetras such as ember or neon tetras, rasboras like chili or harlequin, Corydoras catfish, otocinclus, and peaceful bottom dwellers such as kuhli loaches. Cherry shrimp and nerite snails are usually safe with adult males, though tiny shrimp fry may be eaten. Other male guppies can be kept together in all-male groups, which avoids breeding pressure and is ideal for a display tank. If mixing sexes, keep at least two or three females per male to reduce harassment. Avoid fin-nippers such as tiger barbs, serpae tetras, and some gouramis; avoid large or predatory cichlids, angelfish that may eat small fish, and aggressive species. Bettas are not reliable tank mates, particularly in smaller tanks.
• Feeding habits: Guppies are omnivores with small stomachs and a constant interest in food. Offer a varied diet of high-quality micro pellets or crushed flake, supplemented with live or frozen foods such as daphnia, brine shrimp, and bloodworm. Include vegetable matter through spirulina flakes, blanched spinach, or zucchini to support digestion. Feed small amounts two or three times daily, only what the fish can clear in one to two minutes. Overfeeding is a common cause of water quality problems and bloating, so portion carefully and remove uneaten food. A weekly fasting day can help prevent overconsumption. Because males are active and burn energy quickly, they benefit from regular small meals rather than one large feed. Ensure fry and juveniles receive finely crushed foods if breeding occurs.
• Tank setup and care requirements: Adult male guppies are small, typically around 3–5 cm, so a group can be kept in a 45–60 cm aquarium, but larger tanks are easier to maintain. Use a dark substrate if you want to show off their colours, and add live plants such as Java fern, Anubias, hornwort, and floating plants for cover and natural grazing surfaces. Guppies appreciate subdued to moderate lighting and planted areas where they can retreat. Perform a 25–30% water change weekly, or 50% if stocking is heavy, using a gravel vacuum to remove debris. Rinse filter media in tank water only, never under the tap, to protect beneficial bacteria. Test water weekly during the first months and then fortnightly once stable. Keep the tank covered, maintain consistent temperature, and avoid overcrowding; guppies are messy enough that overstocking quickly leads to stress and disease.
• Health, behaviour and breeding notes: Male guppies are lively, curious mid-to-upper water swimmers and are best kept in groups of six or more to spread any mild aggression and reduce stress. Watch for signs of illness such as clamped fins, white spots, frayed tails, lethargy, or loss of appetite. Fin rot and ich are common in poor water conditions, so quarantine new fish where possible and maintain stable parameters. Males will chase females constantly; if you keep mixed sexes, provide plenty of plants and space, and expect fry. For a low-maintenance display, an all-male group avoids breeding and female harassment. Guppies are not long-lived, often around two to three years with good care, so choose healthy stock with clear eyes, full bellies, and intact fins. Acclimatise carefully, feed a varied diet, and keep water clean to enjoy their colours and activity long-term.