Guppy Care Guide: Tank Size, Water & Tankmates
The guppy (Poecilia reticulata) is one of the most popular freshwater fish in the hobby, and for good reason. They are hardy, colorful, peaceful, and they breed readily, which makes them a wonderful choice for beginners and seasoned aquarists alike. At Tropical Treasures, we keep a rotating selection of guppies in store, from the Diamond Guppy to the Blue Butterfly Lyretail Guppy, plus a budget-friendly Colorful Guppy Pack if you want to start a colony all at once. This guide walks you through everything you need to keep guppies healthy and thriving.
Meet the Guppy
Native to northeastern South America, guppies are small livebearers that give birth to free-swimming fry rather than laying eggs. Males are the showy ones, with flowing tails and bright patterns, while females are larger and more subdued in color. Most guppies reach about 1.5 to 2.5 inches and live for one to two years with good care. If you love livebearers, they pair naturally with platies, Endlers, and swordtails.
Tank Size and Setup
A single trio of guppies can live in a 5–10 gallon tank, but because guppies breed so quickly, we recommend at least 10–20 gallons to give a growing colony room. Provide gentle filtration, a secure lid, and some live plants like java moss or hornwort, which give fry a place to hide and help keep water clean. A planted, well-cycled tank goes a long way toward stable, stress-free guppies.
Water Parameters and Heating
Guppies prefer temperatures of 72–82°F, a pH of 7.0–7.8, and moderately hard water. A reliable aquarium heater keeps temperatures steady, which matters more than hitting an exact number. Always treat tap water with a quality water conditioner before adding it to the tank, and keep up with regular maintenance and partial water changes to keep nitrates low.
Feeding Your Guppy
Guppies are omnivores with hearty appetites. A quality flake or micro-pellet fish food makes a great staple, and they relish occasional treats like baby brine shrimp, daphnia, and blanched vegetables. Feed small amounts once or twice a day, only what they can finish in a minute or two, to keep your water clean and your fish in good shape.
Tankmates and Temperament
Guppies are peaceful and do well in community tanks. Good companions include other small, calm species such as platies, mollies, corydoras, neon tetras, and small rasboras. Avoid known fin-nippers like tiger barbs and large or aggressive fish that may see guppies as a snack. Keeping more females than males (about two to three females per male) reduces stress on the females.
Breeding Guppies
Guppies are famously easy to breed; in fact, the bigger challenge is usually managing the population. Females can give birth to 20–60 fry roughly once a month, and adults will eat fry if they can catch them. Dense plants, a breeding box, or a separate grow-out tank all help fry survive. Feed fry finely crushed food or baby brine shrimp, and they will grow quickly.
Is the Guppy Right for You?
If you want a colorful, active, low-fuss fish that brings a tank to life, the guppy is hard to beat. Just be ready for babies if you keep males and females together. New to the hobby and not sure where to buy? Our guide on buying fish in store vs online explains why starting with healthy, locally acclimated fish makes all the difference.
Frequently Asked Questions
How many guppies should I keep together? Guppies are social and do best in groups of at least five or six. A good starting ratio is two to three females for every male to spread out breeding attention.
Do guppies need a heater? Yes. While they tolerate a range of temperatures, guppies are tropical fish and thrive with a stable heater holding the tank in the low-to-mid 70s°F.
Why are my guppies breeding so much? That is completely normal! Guppies are prolific livebearers. If you do not want more fry, keep only males, or plan ahead for rehoming and grow-out space.