How many guppies in 60 litres?
“I’ve got a 60-litre tank — how many guppies can I add?” It’s one of the most common questions, and the answer isn’t just a number, because guppies have a quirk: they breed at lightning speed. Getting the starting number right is really about anticipating what comes next.
The essentials. Aim for around 8 to 12 adult guppies in a well-filtered, planted 60-litre tank. Better to start low (8–10): guppies breed prolifically and the population climbs on its own. To avoid an explosion, go all-male, or a ratio of 1 male to 2–3 females. And heat the tank (22–26 °C).
The right number in 60 litres
A 60-litre tank is a great volume to start with guppies. Working from adults:
| Setup | Suggested number | Note |
|---|---|---|
| Males only | 10–12 | Very colourful, no breeding |
| Females only | 8–10 | Calm, no breeding |
| Mixed (1 male / 2-3 females) | 8–10 to start | Breeding → watch the population |
These figures assume a cycled, filtered and at least lightly planted tank. A guppy stays small, but it still produces waste: it’s the filtration and maintenance that set the real limit, not just the volume.
The classic beginner trap: buying 6 "mixed male and female" guppies at the shop. Three months later, you've got 40. If you don't want to manage breeding, go all-male — they're the most colourful ones anyway.
Breeding: the real issue
This is THE thing the numbers alone don’t tell you. A female guppy:
- gives birth to 20 to 50 fry every 3–4 weeks;
- can store sperm and produce several batches from a single mating.
The result: an unmanaged mixed group overstocks a 60-litre tank within a few months. Three strategies:
- Males only (the simplest option for a beginner).
- Let nature take its course: without hiding spots, many fry get eaten, which keeps numbers down a bit — but it’s hit and miss.
- Cull / rehome the young regularly.
The conditions for happy guppies
Before adding your guppies, make sure you tick all of these:
- Tank cycled (0 ammonia, 0 nitrite) before adding fish
- Heater set between 22 and 26 °C
- I've decided: all-male, all-female, or a 1M/2-3F ratio
- A few plants for hiding spots and balance
- Suitable filtration and weekly water changes
- A plan to manage the fry (if a mixed group)
The basic gear
Since guppies are tropical, a heater with a thermostat is essential for a 60-litre tank. Here’s our pick:
Thermostatic heater for 60 L
Our pick- Adjustable thermostat for a stable temperature, even in winter
- Wattage suited to a 60 L volume
- Prevents the temperature swings that weaken guppies
Amazon affiliate link. Price and availability may change at any time.
To keep an eye on the temperature day to day, a simple thermometer saves you nasty surprises:
Aquarium thermometer
Our pick- Instant reading of the real water temperature
- Lets you spot a failing heater straight away
- Inexpensive, the logical companion to a heater
Amazon affiliate link. Price and availability may change at any time.
Conclusion
In a 60-litre tank, aim for 8 to 12 adult guppies, starting low. But the real secret with guppies is to decide about breeding from the outset: all-male for a quiet life, or a deliberate mixed group with a plan for the fry. A heated, cycled, planted tank will do the rest.
To pick the right volume for your fish, see our guide to which tank for which fish. And if you’re weighing up other tank mates, read our article Can guppies and shrimp live together?.
How many fish in my tank?
Enter your tank volume and the species you want — we give a cautious estimate.
Indicative estimate. It also depends on filtration and plants, and assumes a cycled tank. When in doubt, stock less: animal welfare comes first.
Frequently asked questions
How many guppies can you keep in a 60-litre tank?
A safe guide is around 8 to 12 adult guppies in a well-filtered, planted 60-litre tank. It's best to start low (8-10), because guppies breed very fast: the real population climbs on its own.
What male-to-female ratio for guppies?
Ideally 1 male to 2-3 females, so the females aren't constantly harassed. Or go all-male (more colourful) to avoid breeding altogether. A 50/50 mixed group stresses the females and the population explodes.
Do guppies really breed that fast?
Yes, hugely. A female can give birth to 20-50 fry every 3-4 weeks, and store sperm for several batches. Without control (males only, predators, or culling), a 60-litre tank is overstocked within a few months.
Does a guppy tank need a heater?
Yes. Guppies are tropical fish that do well between 22 and 26 °C. A heater with a thermostat is recommended to avoid swings, especially in winter or a cool room.
