Guppy Care Guide: How to Keep Healthy, Colorful Guppies

If you ask ten aquarium hobbyists what their first fish was, four of them will say "guppy." There's a reason: guppies are tough, beautiful, peaceful, and they breed so readily you'll have babies whether you planned for them or not. They're the gateway fish to the freshwater hobby, and one of the most affordable — they feature on our list of the best freshwater fish under $20.

This guide covers everything a new guppy keeper needs to know — tank setup, water parameters, food, tank mates, breeding, and the most common health issues.

Meet the guppy

Guppies (Poecilia reticulata) are small livebearing fish native to South America and the Caribbean. Decades of selective breeding have produced an incredible range of colors and tail shapes — fancy guppies, cobra guppies, snakeskin, half black, koi, albino, and dozens more. Males are smaller, slimmer, and dramatically colored. Females are larger, less flashy, and where all those guppy fry come from.

A healthy guppy typically lives 1.5 to 3 years.

Browse our guppy collection, or if you love livebearers, see our full livebearer collection.

Tank size and setup

Guppies are small but active and social.

• Minimum tank size: 10 gallons. Anything smaller is hard to keep stable.
• Recommended: 20 gallons or larger, especially if you plan to keep both sexes (more on that below).
• Long over tall. Guppies use horizontal swimming space more than height.
• Lid recommended. Guppies don't usually jump, but a lid keeps dust, debris, and cats out.
• Keep them in groups. Guppies are social — keep at least 5–6 together.

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Water parameters

Guppies are forgiving but thrive in stable, slightly hard, slightly alkaline water.

• Temperature: 72–82°F (22–28°C). 76–78°F is the sweet spot.
• pH: 7.0–8.0
• Ammonia: 0 ppm
• Nitrite: 0 ppm
• Nitrate: under 30 ppm
• GH: 8–20 dGH (they actually prefer harder water)
• KH: 4–10 dKH

A heater is required for most homes — guppies are tropical fish. See our aquarium heaters.

Always use a water conditioner before water changes. Browse our water conditioner collection.

If your tap water is very soft, guppies appreciate a pinch of crushed coral in the filter or substrate to keep KH/GH up. Soft acidic water is the #1 cause of struggling guppy colonies.

Filtration

Guppies do best with gentle to moderate flow.

• Sponge filter — perfect for fry survival because it won't suck up babies. See our Aquarium Co-Op sponge filters and air pumps.
• HOB or internal filter — fine for adult-only tanks. Add a pre-filter sponge if you have fry. Browse aquarium filtration.

Plants and decor

Guppies adore planted tanks.

• Live plants provide cover for fry, reduce nitrates, and bring out adult colors. Start with beginner-friendly plants like Java Fern, Anubias, Amazon Sword, and Cryptocoryne.
• Floating plants like Frogbit and Water Lettuce give fry vital hiding cover at the surface.
• Avoid sharp decor — male guppies have long flowing fins that can be torn by rough ornaments.

Diet and feeding

Guppies are omnivores and not picky. Variety keeps them healthiest and brings out the brightest colors.

• Staple: a quality tropical flake or micro-pellet. Flake is well-suited to a guppy's small mouth.
• Treats (2–3x per week): frozen or freeze-dried bloodworms, brine shrimp, daphnia, mysis shrimp. Daphnia is excellent for occasional constipation.
• Veggies: a small amount of blanched spinach, zucchini, or spirulina flake adds plant matter to their diet.

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How much, how often: small pinch 1–2x per day, only what they can eat in 1–2 minutes. Overfeeding is one of the most common beginner mistakes and the leading cause of cloudy water and disease.

Tank mates

Guppies are peaceful and work beautifully in community tanks — with the right neighbors.

Great tank mates:

• Corydoras catfish
• Otocinclus
• Neon, ember, and cardinal tetras
• Harlequin rasboras
• Endler's livebearers (they will hybridize with guppies — see below)
• Mystery snails and nerite snails
• Amano shrimp (larger species; cherry shrimp may get eaten)
• Other livebearers: platies, swordtails, and mollies (mollies need slightly harder water — perfect overlap with guppies)

Avoid:

• Fin nippers: tiger barbs, serpae tetras, most barbs
• Bettas — long-finned colorful guppies look like rival males and get attacked
• Aggressive cichlids
• Large or predatory fish — guppies are bite-sized

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Male, female, or both?

This decision shapes your entire tank.

• Males only: the colorful option. Less drama, no fry to manage, but males may chase each other. Keep at least 5–6 together to diffuse attention.
• Females only: less colorful but very peaceful. Note: females sold at most stores have often already been bred and may produce fry months after purchase.
• Mixed: the traditional "guppy colony." Use a 2–3 females per male ratio to keep females from being chased to exhaustion. Expect babies. Lots of babies.

Breeding guppies

You may not have a choice — guppies breed whether you want them to or not. Here's what to know:

• Females give live birth every 4–6 weeks once mature.
• A single mating session can fertilize multiple broods — females store sperm internally.
• Each brood: 10–60 fry, occasionally more.
• Fry are born swimming. They can eat right away.
• Adult guppies eat fry, including their own parents. Provide dense plants, breeding boxes, or move fry to a separate tank to raise them.
• Fry food: crushed flake, baby brine shrimp, micro worms, or commercial fry food. Frequent small meals = fast growth.

If you don't want fry, keep males only, or rehome the babies before they reach breeding age (around 2–3 months).

Maintenance routine

• Daily: observe behavior, check temperature, feed sparingly
• Weekly: 25–30% water change, wipe glass, test parameters
• Monthly: rinse filter media in old tank water, trim plants, gravel-vac

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Common guppy problems

Fin rot / fin tears — ragged or shrinking fins. Almost always caused by poor water quality or a fin nipper tank mate. Fix water first; severe cases need medication.

Ich (white spot disease) — tiny salt-like spots. Raise temperature to 82°F and treat with an ich medication.

Fungus (white fuzz on body) — usually secondary to injury or stress. Treat with an antifungal medication.

"Shimmies" / clamped fins — a guppy that wiggles in place but doesn't go anywhere is usually stressed by water that's too soft, too cold, or full of toxins. Test water and check temperature.

Bent spine / scoliosis — sadly common in heavily inbred fancy strains. Not contagious, but affected fish often have shorter lives.

Overpopulation crash — too many guppies in a small tank leads to ammonia spikes and disease outbreaks. Rehome aggressively.

Browse our fish medications & treatments collection. For serious illnesses, set up a hospital tank.

Frequently asked questions

How many guppies can I keep in a 10 gallon?

Up to about 5–6 adult guppies, ideally all male or all female. Bigger tanks open up much more flexibility.

Do guppies need a heater?

Yes. They're tropical fish and most homes are too cold without one.

Can guppies live with bettas?

Risky. Males in particular get attacked. Female guppies in a heavily planted, large tank sometimes coexist with bettas, but it's a gamble.

How fast do guppies breed?

Very. A single female can produce a brood every 4–6 weeks, with 20–40+ fry each time, for most of her adult life.

Why are my guppies dying?

Top three causes for new keepers: an un-cycled tank, water that's too soft/acidic, and overfeeding. Test your water (ammonia, nitrite, nitrate, GH/KH) and review your feeding schedule.

Do guppies and endlers cross-breed?

Yes. They produce fertile hybrids. If you want to keep either strain pure, don't keep them together.

Why is my male guppy chasing the female constantly?

That's normal male behavior. The fix is more females (2–3 per male) and plenty of plants/hiding spots so females can rest.

Can I keep guppies in a bowl?

No. A 10-gallon heated, filtered, cycled tank is the realistic minimum.

Ready to start your guppy tank?

Guppies are one of the most rewarding fish in the hobby — colorful, peaceful, and packed with personality. We carry a wide range of strains and morphs, plus everything you need to keep them thriving.

Browse our Guppy fish for sale, our Endler's livebearers, or our full livebearer collection. Contact us for help picking the right strain and tank setup.