What size tank does a Guppy need?

Guppy needs a minimum of 10 gallons, with 20 gallons recommended. They are top swimmers. Keep in groups of 3+.

Is Guppy good for beginners?

Guppy is rated "beginner" difficulty (1/5). Great for beginners.

What fish are compatible with Guppy?

Guppy is peaceful. Compatible tank mates include other peaceful fish with similar water parameters (pH 6.8-7.8, temp 72-82°F).

Guppy

Poecilia reticulata

Family: Poeciliidae • Origin: South America

Guppies are the quintessential beginner fish. Males sport spectacular flowing tails in every color.

Min Tank

10 gal

Max Size

2.5"

Temperature

72-82°F

6.8-7.8

Lifespan

2 years

School Size

Swim Level

top

Hardness

8-20 dGH

peacefulbeginneromnivoreschooling

Is Guppy Right for Your Tank?

Guppy is an excellent choice for beginners — rated "beginner" difficulty (1/5). They're hardy, forgiving of minor water parameter fluctuations, and generally easy to feed. At just 10 gallons minimum, they work well in nano tanks and smaller setups.

With a peaceful temperament, Guppy makes a great community fish. They coexist well with other non-aggressive species of similar size. This is a schooling species — keep at least 3 together, or they may become stressed and display abnormal behavior. Expected lifespan: 2 years with proper care.

Common Mistakes with Guppy

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Keeping fewer than 3 together

Guppy is a schooling species — they need a group of at least 3 to feel secure. Lone or paired individuals become stressed, hide constantly, and may develop health issues or aggression.

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Relying on a heater without a thermometer

Guppy needs 72–82°F. Heaters malfunction or drift over time — always use a separate thermometer to verify. Temperature swings of even 3–4°F can trigger stress and disease, particularly ich.

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Putting them in a tank under 10 gallons

While 10 gallons is the minimum, nano tanks require more frequent water changes and leave less room for error. A slightly larger tank (20 gal) is much more forgiving.